A Project of The Annenberg Public Policy Center

Did Air Quality Improve Under Obama?

EPA head Scott Pruitt criticized former President Barack Obama for leaving 40 percent of Americans with air quality that doesn’t meet EPA standards. But a report Pruitt’s office cited as evidence said there had been a “major improvement” in air quality under Obama.

Hurricane Harvey and Climate Change

Hurricane Harvey has brought with it both a record amount of rain and questions about how much climate change can be blamed for the storm. Climate change did not cause Harvey, or any other storm, but it makes intense storms like Harvey more likely to occur, scientists say.

Does Glyphosate Cause Cancer?

Q: Does the herbicide glyphosate cause cancer? 
A: There is evidence to suggest it may cause cancer at very high doses, but not at the low doses typically found in foods.

SciCheck on the Air

This year, SciCheck writer Vanessa Schipani has appeared on NBC10 in Philadelphia several times to discuss some of her stories.

CO2: Friend or Foe to Agriculture?

Rep. Lamar Smith said climate change “alarmists” ignore the “positive impacts” of more carbon dioxide in the atmosphere, such as increased food production and quality. But the impact of increased CO2 levels on agriculture is more complicated than that — and, on balance, likely negative, particularly in the future.

Smith Spins NASA Funding

Rep. Lamar Smith said that, after national security agencies, “NASA received the most favorable budget request from the Trump administration.” True, but President Trump’s 2018 proposal would still cut NASA’s budget by about 3 percent compared with the agency’s enacted budget for 2017.

Is Bacon Better for You Than Tilapia?

Q: Is bacon better for you than tilapia? Does tilapia cause cancer and/or Alzheimer’s disease?

A: No. These false claims, spread by multiple websites, are not supported by solid scientific evidence. 

Scientific Evidence and the EU Court

A European Union court decision about vaccines raises interesting two scientific questions: How do scientists decide whether vaccines can cause conditions such as multiple sclerosis. And how certain can they be about their conclusions?

Trump Official Wrong About Warming, Again

In an interview on CNBC, Energy Secretary Rick Perry said carbon dioxide is not “the primary control knob” for the Earth’s temperature and climate. But scientists say it’s “extremely likely” that human activity — primarily CO2 emissions — is the main cause of global warming.

Will Paris Have a ‘Tiny’ Effect on Warming?

President Donald Trump and his top environmental official said the Paris Agreement would reduce the global average temperature by only 0.2 degrees Celsius. Former Vice President Al Gore said that’s “not true.” Who’s right?