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To say that this was a big year for the environmental movement is an understatement. From the Paris climate agreement to the indelible progress of renewable energy, 2015 was a landmark year.

And people didn’t hesitate to talk about it. Here are the 20 most popular hashtags on Twitter inspired by environmental progress made in 2015:

1. #ActOnClimate

Activists ramped up the pressure on world leaders to reach a strong, global agreement on climate change at the UN COP21 Paris climate talks, calling it “our last, best chance” to do so. Climate change received far more attention from mainstream media outlets this year, and according to recent polling, more Americans than ever accept the science on global warming.

And part of that heightened awareness is thanks to the efforts of Pope Francis, who repeatedly spoke out about the need to take immediate action on climate change in 2015.

2. #BlackFridayin3Words

More and more Americans became disenchanted with Black Friday, and they took to Twitter to express themselves in often very humorous ways.

3. #OptOutside

REI made waves when it announced that it would be closing all of its 143 retail locations, headquarters and two distribution centers on both Thanksgiving Day and Black Friday. All 12,000 full- and part-time employees received paid time off as the company encouraged them and everyone else to go outside instead.

4. #Go100Percent

UruguayBurlington, VermontAspen, Colorado; and Kodiak Island, Alaska were among the countries and cities that transitioned to run completely on renewables this year.

Costa Rica ran on renewables for almost all of 2015. From small towns like Nassau, New York to major cities such as San DiegoVancouver and Las Vegas, pledges were made to go 100 percent renewable. Sweden vowed to as well. And Hawaii pledged to do so by 2045—the most ambitious standard set by a U.S. state thus far.

5. #Renewables

Renewables had another record-breaking year with solar and wind power growing like crazy—providing more than 5 percent of the nation’s electricity for the first time—and the country’s first offshore wind power project is finally under construction.

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