Roger Pielke Jr.
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Roger Pielke Jr.
@thehonestbroker.bsky.social

undisciplined scholar and recovering academic @AEI @DNVA1 @CUBoulder @UCL | Subscribe to The Honest Broker ➡️ http://rogerpielkejr.substack.com

Roger A. Pielke Jr. is an American political scientist and a nonresident senior fellow at the conservative think tank American Enterprise Institute. Before he was a professor of the Cooperative Institute for Research in Environmental Sciences (CIRES), and was the director of the Sports Governance Center within the Department of Athletics at the Center for Science and Technology Policy Research at the University of Colorado Boulder. .. more

Environmental science 55%
Geography 19%

Fantastic 🧵⬇️
Has climate policy* worked?

There is an argument that CO2 per unit GDP has not accelerated in 50 years (top left).

This term is made of two componets:
* Energy per GDP (bottom left) which has not changed
* CO2 per Energy (top right), this is where the action is

1/
Has climate policy* worked?

There is an argument that CO2 per unit GDP has not accelerated in 50 years (top left).

This term is made of two componets:
* Energy per GDP (bottom left) which has not changed
* CO2 per Energy (top right), this is where the action is

1/

We made a different argument about the importance of both Vienna and Montreal on ozone policy:

Betsill, M. M., & Pielke, R. A. (1998). Blurring the boundaries: domestic and international ozone politics and lessons for climate change. International Environmental Affairs, 10, 147-172

"In its COP30 Global Mutirão Decision, the U.N. climate change negotiators now basically agree with the projections made by Pielke and his colleagues."
reason.com/2025/11/24/t...
The U.N. Has Now Held 30 Climate Change Conferences That Have Accomplished Almost Nothing
COP30 delivered few wins: no phaseout roadmap, weak emissions cuts, and massive gaps in promised climate finance.
reason.com

Reposted by Lucas Bergkamp

Sure, agreed

When will we first detect accelerated decarbonization in real-world data?

The Battle for Climate Science and Policy Past—And Why It Matters
The most important debate in climate science today is about the past not the future
rogerpielkejr.substack.com/p/the-battle...
The Battle for Climate Science and Policy Past—And Why It Matters
The most important debate in climate science today is about the past not the future
rogerpielkejr.substack.com