En-ROADS Model Version History

May 2021 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.39
  • Updated data for non-CO2 GHGs through 2018 using PRIMAP 2.2.

Interface Changes

New

  • Translation into French: En-ROADS is now available in French.
  • Graph replacements: Because of differences in carrier efficiencies, the percent of capital that is electric is not the same as the percent of final energy for that capital. We have therefore changed the associated graphs from “Electric Share of Final Energy” to “Electric Share of Capital” for Buildings & Industry and for Transport.
  • We have rearranged the ordering of the Simulation > Assumptions sliders to follow the relative order of the slider groups on the En-ROADS main view.

Updated

  • Various small text edits to graph and slider descriptions.

April 2021 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.38
  • Added model structure for carbon dioxide removal (CDR), carbon capture and storage (CCS), and economic impact of climate change on GDP.

Interface Changes

New

  • Structural upgrades to the user interface: We have updated the underlying architecture of En-ROADS to allow future feature additions to be added more easily. You will not see any functional differences in the operation of En-ROADS or in the interface layout of En-ROADS. There are some aesthetic improvements and multiple changes that make the simulation easier to operate. User experience improvements include:

    • The currently selected graph is indicated in the graph selection menu.
    • Sliders and menus work better on a wider variety of touchscreen devices (no more touchscreen warnings).
    • The interface is more responsive when resizing the browser window.
    • The simulation loads faster.
    • The Actions & Outcomes view size adapts to its contents.
    • Many other subtle additions that will enhance the usability of the simulation.
  • New Assumptions slider for social discount rate: We have added a new input slider, “Social discount rate,” under the Assumptions > Economic impact of climate change heading. The effect of changes to the social discount rate are displayed in a new graph, “Global GDP Loss” and in the Actions & Outcomes table as “Discounted Cumulative Damage through 2100.”

  • New Assumptions slider for fossil fuel CCS leak rate: We have added a new input slider, “Fossil fuel CCS leak rate,” under the Assumptions > Carbon capture & storage (CCS) effectiveness heading. This slider allows the user to test non-zero leak rates for fossil fuel CCS.

  • New graphs added to the simulation:

    • In the Removals and Land Use group:
      • Annual Volume of Captured CO2
      • Cumulative Storage of CO2
    • GDP-related graphs relocated to the Population & GDP group:
      • Reduction in GDP vs Temperature
      • Reduction in GDP from Climate Impacts
    • New GDP-related graphs also under the Population & GDP group:
      • GDP per Capita Growth Rate
      • Global GDP Loss (which also shows the discounted value of economic damage)

    Read more in our blog post about climate impacts on GDP.

  • New historical comparison graphs: There is a new graph menu group, Model Comparison—Historical. These graphs compare historical data to En-ROADS simulation output from 1990-2020.

    • Temperature History
    • Marginal Cost of Solar Electricity History
    • Primary Energy Demand of Coal, Oil, and Gas History
    • Primary Energy Demand of Wind and Solar History
    • Greenhouse Gas Net Emissions History
  • Added Spanish translations of graph and slider descriptions.

March 2021 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.37
  • Added model structure for economic impact of climate change on GDP.

Interface Changes

Fixed

  • Improved the colors on the “Renewables Capacity — Area” graph to make the plots easier to distinguish.
  • Changed the Simulation > Assumptions > Climate sensitivity > “Sea level rise from ice sheet melting” slider label to “Additional sea level rise from ice sheet melt” and edited its associated description text for greater clarity.

New

  • Translation into Italian: En-ROADS is now available in Italian.
  • New slider for Economic impact of climate change: A new slider type with two input “handles” has been added to the Assumptions menu: Economic impact of climate change. The two handles control “Reduction in GDP at 2ºC from climate impacts” and “Maximum reduction in GDP.”
  • Two new “Climate impact on GDP” related graphs have been added under the Impacts header:
    • Reduction in GDP vs Temperature
    • Reduction in GDP from Climate Impacts
  • Read more in our blog post about the economic impact of climate change in En-ROADS.
  • Added an Assumptions slider for the progress ratio of electrifying transport, buildings, and industry under Simulation > Assumptions > Progress ratio > Electric carrier.

February 2021 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.36
  • Updated temperature change data and reference years using new temperature data update in HADCRUT5 dataset from December 2020.
  • Modified En-ROADS to use baseline data from C-ROADS that is fed into the En-ROADS data model for initialization.
  • Updated profitability effects to avoid getting too large with extremes that were leading to drastic and unrealistic swings that could be seen in capacity, utilization, and pricing.
  • PRIMAP 2.1 data (2019) of historic GHG emissions were used to update initial fractions of each non-CO2 GHG emissions from agriculture, waste, extracted fuel supply, demand capital, and non-CO2 GHG emissions from energy use) and to improve calibration.
  • Improved and simplified CH4 concentration calibration to avoid unnecessarily introducing more uncertainty in response to CH4 concentration effects on uptake and to include updated PRIMAP data.

Fixed

  • Resolved unexpected bioenergy demand spikes that had appeared in the previous release for some scenarios.

Interface Changes

New

  • Four new translations: New translations added for simplified Chinese, traditional Chinese, German, and Bulgarian. More languages on the way in March!

  • New graphs: New graphs added related to enhanced mineralization and other carbon removal approaches:

    • Land for Growing CO2-Removal Biomass
    • Land for Farming with CO2 Removal
    • Bulk Material for Mineralization

    For more details about the carbon removal approaches displayed in these new graphs see this related blog post.

  • Added new assumptions specific to enhanced mineralization (found in Assumptions > Mineralization settings).

  • Relocated the Language menu to the first menu position and included a globe icon as an indicator for the menu.

Fixed

  • Changed terminology from “mid-19th century” to 1850.
  • Adjusted some graph and slider labels for better fit in translations.

January 2021 Release

Interface Changes

New

  • Translation into Turkish: We have a new translation into Turkish this release. Check it out under the Language menu.
  • New graph: Added a new graph, “% Electricity Consumption from Low-Carbon Sources”. Find it under “Final Energy Consumption Types” under the Graphs menu.
  • Corrected all references to Purchasing Power Parity to $US 2017. Other various text edits.

December 2020 Release

Read more details about the update.

Watch a video overview of the details of the update.

Model Upgrade

New

  • Updated Baseline: Several model adjustments related to renewable energy sources, pre-industrial temperature benchmarking, and modeling of non-greenhouse gas forcings have lowered the baseline temperature in 2100 to 3.6°C/6.5°F.
  • Renewables are now disaggregated and explicitly modeled for solar, wind, geothermal, and other renewables.
  • We also account for the historical subsidies for renewables and the “soft costs” associated with each renewable type. These soft costs have declined as experience was gained.
  • The temperature change reported is now relative to the 19th century.
  • Initial heat is now calculated from historic temperature change in 1990, taken from temperature anomaly relative to 19th century from GISS (2020) and Hadley (2020) and adjusted to be relative to 18th century mean.
  • Other forcings taken from Meinshausen (2011) to reflect those relative to 18th century. Natural forcings easier to subtract to obtain anthropogenic forcings for Equivalent CO2 concentration.
  • Initial CO2, CH4, and N2O updated to reflect actual data from GISS instead of C-ROADS 1990 values.
  • Decrease in extraction overheating sensitivity and profitability effects on retirement rates of supply sources to dampen rapid changes in bioenergy demand.

Updated

  • En-ROADS model to version 2.7.35c

Interface Changes

New

  • New default graphs: Changed the default graphs from “Global Sources of Primary Energy” and “Temperature Change” to “Global Sources of Primary Energy — Area” and “Greenhouse Gas Net Emissions”.
  • Added several graphs related to renewable energy:
    • “Low Carbon Average Cost of Electricity Production by Source”,
    • “Low Carbon Marginal Cost of Electricity Production by Source”, and
    • “Renewables Capacity — Area”.
  • Changed the phrase “Business as usual” and “BAU” to “Baseline” across the interface, graphs, legends and descriptions.
  • Renamed “New Technology” Energy Supply to “New Zero Carbon” Energy Supply throughout En-ROADS interface.
  • Changed the population input slider to display “billion people in 2100” instead of the -1 to +1 index range.
  • Expanded the inputs for Economic Growth from a single input to now include “Long-term economic growth”, “Near-term economic growth” and a “Transition time” for the “Near-term economic growth” to converge on the “Long-term economic growth” rate.

Fixed

  • Changed the start year for input sliders to 2021.
  • The ranges for Tax/Subsidy sliders have been updated.
  • Some graph descriptions have been edited for clarity.
  • Adjusted the Y-axis maximum on some graphs to display the data better over different input configurations.

October 2020 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.29b
  • Corrected the “New Tech” plot in the “Marginal Cost of Electricity Production” graph when the “New Technology” advanced sliders are adjusted.

Interface Changes

Fixed

  • Added a short description at the top of the Assumptions panel to clarify how the sliders behave relative to the “Current” and “Business as Usual” scenarios.
  • Fixed descriptions of transport electrification sliders to remove mention of ships and airplanes.

September 2020 Release

In addition to the details listed below, we’ve made a video highlighting the important new features.

Check it out: September 2020 Release Video

Interface Changes

New

  • Spanish: En-ROADS is now available in Spanish! We’re working to bring En-ROADS to even more languages too.
  • Air Pollution graphs: There are two new graphs in the “Graphs > Impacts” menu showing Air Pollution (PM2.5 Emissions) from the energy sector. Additionally, sliders were added in the “Assumptions” panel to allow for adjusting the emission factor assumptions.

Model Upgrade

Updated

  • En-ROADS model to version 2.7.29

Other Interface Changes

Updated

  • Fixed the Kaya view to show “Carbon Intensity of Final Energy” instead of “Carbon Intensity of Primary Energy”.
  • Fixed the menu bar to make it easier to select sub-menu items on iPad.
  • Fixed tooltips on iPad so that they disappear automatically.
  • Fixed alignment of slider handles on iPad.
  • Fixed full screen layout on iPad so that the menu bar is not obscured by the Safari-provided controls.
  • Fixed the large graph window to display in the current language (instead of defaulting to English).
  • Fixed the x-axis labels on Kaya graphs to not overlap on large screens.
  • Fixed graphs to not show tooltips for years outside the displayed range.
  • Removed calibration graphs (these will be replaced by improved graphs in an upcoming release).

August 2020 Release

Interface Changes

New

  • Portuguese: En-ROADS is now available in Portuguese! Localization to more languages is in progress, and we hope to come to your native language soon.
  • Initial iPad Support: You can now run En-ROADS on your iPad (in Safari or your preferred browser)! In this release, the user experience is better on iPad models released in the last 3 years. In upcoming releases, we will be working to improve performance and refine the user experience across all iPad models.

Updated

  • Improved performance in a number of areas, so sliders should feel smoother and more responsive (and further improvements are in the works).
  • When sharing a scenario, the user’s preference for Metric vs U.S. Units is captured and remembered in the URL.

Control Slider Related Changes

Fixed

  • Updated the “Carbon Price” slider description to include bioenergy in the list of impacts.
  • Removed accidental mention of deforestation in the “Other greenhouse gases start year” slider description under “Methane & Other Gases”.

July 2020 Release

Graphs

Fixed

  • Corrected the y-axis of the “Marginal Cost of Electricity Production” graph to adjust dynamically to keep graph lines in view.
  • Corrected the “Renewables Primary Energy Demand” graph to reflect hydro in addition to renewables.

Control Slider Related Changes

Fixed

  • Improved descriptions for the “Year to stop building new infrastructure” sliders for coal, oil, and natural gas.

Other Interface Changes

Updated

  • Improved email sharing of scenarios by showing a preview of the message to be sent, and allowing for a custom note to be included with the shared scenario.
  • Changed the welcome screen to direct feedback and questions to support.climateinteractive.org.
  • Changed the “General FAQs” link under the Help menu to direct to the Knowledge Base on the support site.

May 2020 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.19
  • Add email sharing of your current scenario to “Share Scenario” menu button.
  • Update GDP with 2018 World Bank data.

Fixed

  • Minor edits to description texts

April 2020 Release

Model Upgrade

Updated

  • En-ROADS model to version 2.7.14
  • Added link to “Uses for En-ROADS” under the Help menu
  • Add menu control for “Reset Policies” sliders and “Reset Assumptions” sliders under “Simulation” menu; changed wording of “Reset” to “Reset Policies & Assumptions.”

Graphs

  • When switching from Metric Units to U.S. Units, the “Land for Carbon Dioxide Removal” graph switches from “Million hectares” to “Million acres”.

Fixed

  • Improved location of icons in the top toolbar to help avoid accidental clicks on the “Reset Policies & Assumptions” icon (formerly, “Reset sliders” tool tip).
  • Correcting Large graph feature so graphs are sized correctly in the remote window.
  • Edits to description texts for “Coal carbon capture & storage (CCS) (tax/subsidy)” slider, “Gas carbon capture & storage (CCS) (tax/subsidy)” slider and the overall description for Nuclear in the advanced views.

March 2020 Release

Along with the details listed below, we’ve made a cool video highlighting the important feature additions and changes to model behavior.

Check it out: March 2020 Release Video

Model Upgrade

Updated

  • En-ROADS model to version 2.7.11
  • Updated the equation for the Energy Intensity of New Capital to better respond to price effects
  • BAU improvement rate in emission intensity and Annual improvement rate of emission intensity for F-gases were adjusted to reflect SSP2 baseline trajectories
  • The settings for CH4 and N2O emissions from agriculture and waste have also been slightly updated

Graphs

Fixed

  • Add “Hydro” data to “Average Cost of Electricity Production” graph and correct the name of “Renew/Hydro” to Renewables”
  • Corrected several missing Related Graphs in some advanced views
  • Corrected the variable in “Marginal Cost of Renewables” graph
  • Corrected typo in descriptions for N2O and CH4 graphs (Megatons was corrected to 1x106)
  • The y-axis label in graph “CO2 Emissions” was corrected to Gigatons CO2/year

Updated

  • Edited the description for “CH4 Emissions” graph and corrected the plotted variable to display anthropogenic CH4 emissions
  • Edited “Storage Costs” graph description for clarity
  • Edited the description for “Cumulative CO2 Emissions” graph
  • Changed the graph name from “Fuel Production Cost” to “Fuel Production Cost by Source” to make it consistent with the titles of the other graphs in the Financial category that are broken out by energy source
  • Added “Greenhouse Gas Net Emissions by Gas—Area” to related graphs for Deforestation

Control Slider Related Changes

Fixed

  • Updated New Tech slider description to match what the slider settings do
  • Added back a missing description for slider, “Coal CCS R&D breakthrough cost reduction”
  • Edit description for slider, “% Reduction in Coal Utilization”

Updated

  • Edit slider names referring to final carbon price, removing the word “target” so it is now:
    • Final carbon price (previously, Final Carbon price final target)
    • Year to start achieving final carbon price (previously, Year to start achieving final carbon price target)
    • Years to achieve final carbon price (previously, Years to achieve final carbon price target)
  • Added back assumptions sliders for “Methane emissions from biological activity”, “Effect of temperature on methane emissions from permafrost and clathrates”, and “Temperature threshold for permafrost and clathrates”

Other Interface Changes

New

  • You can create a large copy of any of the graphs to use on additional screens or monitors. The graph outputs in the copies remain connected to changes in the control input sliders. These graphs are accessed under the View menu, as “Large Left Graph and “Large Right graph”. You may select multiple copies of left or right graphs.

Coming Soon

  • Localization to many languages is in process! We hope to come to your native language soon!