The leaders of California and New Zealand have signed a pledge agreeing to help fight climate change

Climate activists are reflecting on discussions during this week's World Economic Forum in Davos, Switzerland

A court ruled the state attorney general can pursue a civil lawsuit that accused Exxon Mobil of misleading investors about its products and their impact on the climate.

Shell says it wants to cut emissions while tapping new sources of fossil fuel.

The much-ballyhooed World Economic Forum in the Swiss Alpine town of Davos gets underway this week after a two-year hiatus due to the COVID-19 pandemic

It will be the World Economic Forum's first in-person gathering in two years.

A DoD-funded “resiliency review” finds Parris Island facing growing threats.

Wall Street efforts to consider environmental risk are growing.

New research shows climate change is worsening the spring allergy season. ABC News' Alex Presha reports.

The U.S. Department of the Interior says two energy companies bid a combined $315 million in an auction for the rights to produce power from wind energy in two areas off the coasts of North Carolina and South Carolina

ABC News' Matt Gutman reports from Kenya on the drought affecting countries in East Africa, which is exacerbating the hunger crisis and impacting more than 20 million people.

At least 15 million people across Kenya, Ethiopia and Somalia are on the verge of starvation due to drought, according to nonprofit group Save the Children.

Nonprofit group Save the Children reports that nearly 15 million people across Kenya, Ethiopia and Somalia are already on the verge of starvation, half of them are children.

ABC News’ Rob Marciano reports on the impact of methane on climate change and how winter sports facilities like Aspen Ski Company have a stake in encouraging clean energy.

An unusually early and brutal heat wave is scorching parts of India, where acute power shortages are affecting millions as demand for electricity surges to record levels

New before and after images of Lake Mead from 2020 and 2021 show the depth of the shrinking lake, which serves as a water supply for millions in Arizona, California and Nevada.

ABC News' Devin Dwyer reports on how eco-extremists labeled domestic terrorists could impact the future of protests in the U.S.

Climate change is likely to increase the number of viral transmissions across species, posing further risk to other animals and humans, according to a study published in Nature.

Scientists now believe that global warming will significantly increase the number of viral transmissions across species in the coming decades.

The Indigenous-led Land Back movement has become a climate justice tool for activists.

Native and Indigenous tribes are using traditional skills on reacquired ancestral land to combat climate change.

The ruling Communist Party is trying to revive a sluggish economy.

Children across the country were involved in a variety of activities to mark Earth Day.

At NASA's Earth Day Celebration in Washington, D.C., NASA administrator Bill Nelson spoke about the newly funded Earth Information Center.

This is what climate anxiety looks like for 18 high school students.

The survival of national parks -- and the landscapes and ecosystems they house -- is precarious as global warming continues.

ABC News' Kayna Whitworth joins scientists and arborists using ropes to climb up sequoias, allowing them to access tree canopies and check for decay as forests face threats from climate change.

President Joe Biden signed an executive order to protect more of the nation’s forests on Earth Day. White House national climate adviser Gina McCarthy explains Biden’s larger climate goals.

A rehabilitated green sea turtle has been released back to the ocean from the Florida Keys to mark Earth Day

The war in Ukraine doesn’t just have human costs, experts say it’s wreaking havoc on the country’s ecology. Carroll Muffett, the CEO of the Center for International Environmental Law, explains.

Cash Daniels hopes to collect 1 million pounds of litter in 2022 to help the teen's community in Tennesse along with other teen environmentalists, "The CleanUp Kids".

"Youth often feel obligated to do this because of the pure fact that we are young and we need this protection," said Grace Gibson-Snyder, an 18-year-old plaintiff.

More than two years after he started work on it, Gov. Tom Wolf is set to enact the centerpiece of his plan to fight climate change

Scientists say last summer was the hottest summer on record in Europe, with temperatures 1.8 degrees Fahrenheit higher than the average for the previous three decades

Florida utilities would gradually increase their renewable electricity, reaching 100% by 2050 under a proposed rule unveiled by the state’s agriculture commissioner

The key to curbing the greenhouse gas emissions that come from the agriculture industry may be hidden beneath the surface.

There are 423 national parks in the U.S. -- with at least one in every state.

The pace in which the world needs to transition from fossil fuels to renewable energy is becoming increasingly urgent.

Nearly two decades of drought has led the Colorado River to top the American Rivers U.S.'s most endangered rivers list. Stakeholders who depend on its water are scrambling to adapt.

ABC News' Linsey Davis speaks with Dr. Jane Goodall and Apple's Vice President of Environment, Policy and Social Initiatives Lisa Jackson on a new effort to promote recycling old iPhones.

The Colorado River is at the top of the endangered rivers list, and ranchers who have depended on its freshwater are scrambling to adapt.

Fashion contributes up to 10% of the world’s greenhouse gas emissions and much of this is generated by clothing production. A few companies are putting sustainability at the center of its brand.

ABC News’ Kayna Whitworth reports on the unprecedented crisis facing the Colorado River and how it could impact millions of people across seven states and two countries.

Water levels of the Colorado River, which flows through seven states and serves 40 million people across the West, have fallen 20% since 2000.

It is a major freshwater source for over 40 million people.

A U.N. initiative is bringing video game companies together to tackle environmental issues through play.

ABC News’ Ginger Zee examines how President Joe Biden plans to combat climate change on "This Week."

British police say six people were arrested after climate change activists climbed onto an oil tanker in central London to protest investments in fossil fuel

Climate-change protesters have snarled traffic by blocking four London bridges

ABC News’ Ginger Zee takes a look at wearable solar-powered technology and unique products to capture solar energy to help combat climate change.