“She has been a catalytic leader,” Sally Benson says of Greta Thunberg.

“We’ve learned in the last several years that not only is global warming already occurring, but that we are already experiencing the impacts,” says Noah Diffenbaugh.

“It’s really astounding how carbon dioxide emissions have been cut,” says Anthony Kovscek, while Sally Benson notes how California pioneered energy efficiency after the 1970s energy crisis.

Geophysicist Dustin Schroeder discusses his work analyzing ice-penetrating radar data from surveys of Antarctica taken in the 1970s.

“In principle, when we know where the energy is being stored, we can say which places are more likely to have an earthquake and which places less," says Howard Zebker.

Chris Field projects crop losses of up to 40 percent by 2050, depending on the location.

A story on the impacts of climate change cites Marshall Burke's study on the relationship between climate and suicide and how it affects climate activism. 

Gabrielle Wong-Parodi speaks about the impacts of individual actions on climate change.

Dustin Schroeder speaks about his research using historic radar film to understand glacier melt in Antarctica.

Marshall Burke explains the economic cost of climate change in the United States.

Marshall Burke speaks about the effect of climate change on flooding.

“The only downside to a pledge like this is if people misinterpret a pledge to mean action,” says Rob Jackson.

"All the discussions of doom and gloom have not led to change we need," says Rob Jackson.

“They didn’t know what the shape of the continent was, whether it had mountains — this wasn’t about glaciology or studying ice sheets. It was really fundamental Earth exploration,” says Dusty Schroeder.

Research by PhD student Malcolm Hodgskiss finds new evidence for a mass extinction event 2.05 billion years ago in barite samples from Hudson Bay, Canada .

Noah Diffenbaugh comments on the potential impact of warm water in the Pacific Ocean.