Recent changes on this page

April 8 Sanders and Gabbard dropped out of the presidential race.

March 5 Warren dropped out of the presidential race.

March 4 Bloomberg dropped out of the presidential race.

March 2 Klobuchar dropped out of the presidential race.

March 1 Buttigieg dropped out of the presidential race.

March 1 Steyer dropped out of the presidential race.

Feb. 25 Reflected Buttigieg's 2050 goal for net-zero U.S. emissions.

Feb. 12 Patrick dropped out of presidential race.

Feb. 11 Bennet and Yang dropped out of presidential race.

Jan. 31 Adjusted Patrick's stance on fracking after additional input from his campaign.

Jan. 31 Delaney dropped out of presidential race.

Jan. 18 Included Patrick's support for the Green New Deal, stopping the expansion of nuclear energy at this time, a moratorium on fracking, ending fossil fuel extraction on public lands and eliminating fossil fuel subsidies.

Jan. 17 More clearly explained Sanders's stance on a carbon tax. Adjusted question order.

Jan. 13 Booker dropped out of presidential race.

Jan. 10 Williamson dropped out of presidential race.

Jan. 6 Added Bloomberg answers on climate change in survey responses returned by his campaign.

Jan. 2 Castro dropped out of presidential race.

Dec. 19 Patrick's campaign relayed his openness to a carbon pricing mechanism.

Dec. 11 Added Bloomberg and Patrick.

Dec. 3 Harris dropped out of presidential race.

Dec. 2 Bullock dropped out of presidential race.

Dec. 1 Sestak dropped out of presidential race.

Nov. 20 Warren's campaign confirmed that she supports phasing out nuclear power.

Nov. 16 Adjusted Sanders's position on a carbon tax, from 'Open to it' to 'No' following a change from his campaign.

Nov. 1 O'Rourke dropped out of presidential race

Oct. 27 Added responses from Steyer, including his stance of no new nuclear power plants at this time and a ban on all fracking, though “that can’t happen instantly.”

Oct. 24 Ryan dropped out of presidential race.

Oct. 21 Removing Messam, who reported no spending in Q3 of 2019.

Sept. 20 De Blasio dropped out of presidential race.

Sept. 10 Added positions for Steyer based on his climate plan, as well as quotes for several candidates on the fracking ban question.

Sept. 5 Adjusted Biden view on fracking following confirmation of his stance from the campaign.

Sept. 5 Included many stances and quotes from 10 candidates who participated in CNN’s climate town hall event.

Sept. 4 Adjusted Warren's position on fracking after a clarification from her campaign.

Sept. 4 Additional information added from the climate plans of several candidates, including many that include specific U.S. emissions targets. Moved Castro out of 'Unclear' to better characterize his position on fracking.

Sept. 3 Added Klobuchar's position on fossil fuel leasing on federal lands after she released a climate plan.

Aug. 28 Gillibrand dropped out of presidential race.

Aug. 23 Moulton dropped out of presidential race.

Aug. 22 Inslee dropped out of presidential race.

Aug. 19 Updated several positions for Castro based on a response from his campaign.

Aug. 15 Hickenlooper dropped out of presidential race.

Aug. 2 Added Booker quote on the Paris climate agreement, Biden quote on fracking.

July 30 Additional information on Gillibrand's support for a carbon tax. Added Sestak.

July 15 Updated categories on the fracking ban question after addition correspondence with several campaigns to clarify their stances.

July 8 Swalwell dropped out of presidential race.

June 25 Updated Inslee’s position on carbon pricing from “open to it” to “yes” after he released a policy proposal.

June 21 Updated Gabbard’s position on carbon pricing from “open to it” to “no” based on a response from her campaign.

June 21 Added Warren’s position on carbon pricing based on a response from her campaign.

June 20 Updated O’Rourke’s position on fracking from “don’t ban it, but regulate it better” to “ban it” and Hickenlooper’s position on fracking from “don’t ban it” to “don’t ban it, but regulate it better” based on response from the campaigns. Added positions for Hickenlooper and Yang on several issues based on responses from the campaigns.

June 13 Adjusted Hickenlooper's position on carbon pricing after he released his climate plan.

June 5 Adjusted O'Rourke position on the Green New Deal and added his specific U.S. target in the Paris agreement question, following campaign guidance.

June 4 Added Biden positions to several questions after he released his climate plan and his campaign confirmed his stances.

June 3 Moved Gabbard position on campaign carbon footprint and Harris stance on Paris agreement following additional campaign guidance.

June 3 Updated campaign carbon footprint question with additional categories to reflect variety of answers. Also added Harris answers on fossil fuel subsidies and leasing on public lands after her campaign indicated her co-sponsorship of relevant legislation.

June 3 Adjusted Sanders answer on the Paris agreement after clarification from his campaign.

June 3 Updated Bennet’s details on the Green New Deal and fracking based on more information from his campaign.

June 1 Adjusted Buttigieg's position on fracking given additional information from his campaign.

June 1 Adjusted Gabbard’s answers on the Green New Deal and the Paris climate agreement to reflect a clarification from her campaign and a specific pledge.

May 31 Page published.