The biggest lesson from the first Earth Day: When we come together, the impact can be monumental.

President Trump stood in front of an audience of operating engineers in Crosby, Texas, on Wednesday and promised to make it easier for them to lay pipe.

Kids are taking over the streets in other countries, rallying and chanting and refusing to go to school one day a week.

A picture of a black hole is one of those great, self-negating concepts, like the sound of silence, the presence of absence or the lives of the dead. The nature of one refutes the other. But a picture of a black hole has arrived nonetheless — revealed Wednesday morning in simultaneous press conferences held in six different locations around the world.

THE WORLD'S MOST INFLUENTIAL PEOPLE IN CLIMATE POLICY

At a time when young people everywhere are marching to demand action on climate, it's more important than ever to celebrate and support those with the most power to act: the people driving tangible policy change.

Our next president needs to be a real climate leader. That means supporting a Green New Deal to create millions of good jobs transitioning to the 100% renewable energy-powered economy we need, opposing climate-wrecking fossil fuel projects, and refusing to take big polluters’ money. See where all the candidates stand—then, take action.

The beginnings of sustainability initiatives can be traced to the Industrial Revolution, when people first started questioning its main negative consequence - air pollution.

The world’s capacity to produce food is being undermined by humanity’s failure to protect biodiversity, according to the first UN study of the plants, animals and micro-organisms that help to put meals on our plates.

“It is worse, much worse, than you think.” That’s the opening line of a damning new book by journalist David Wallace-Wells that offers an unflinching look at the growing climate catastrophe.

A lawsuit filed on behalf of 21 kids alleges the U.S. government knowingly failed to protect them from climate change. If the plaintiffs win, it could mean massive changes for the use of fossil fuels.

Today is historic. As I write, 100,000s of children and students have already walked out of school to strike for the climate. And their global call to action is only just beginning – with incredible images and video from Australia, the Pacific, Asia, Europe and Africa already flowing in.

Colorado's new governor is starting out the new year with a plan to reduce transportation carbon emissions to protect the environment and public health.

Just over a century ago in Ludwigshafen, Germany, a scientist named Carl Bosch assembled a team of engineers to exploit a new technique in chemistry. A year earlier, another German chemist, Fritz Haber, hit upon a process to pull nitrogen (N) from the air and combine it with hydrogen (H) to produce tiny amounts of ammonia (NH₃). But Haber’s process was delicate, requiring the maintenance of high temperatures and high pressure.

Whether it's a deadly cold snap or a hole under an Antarctic glacier or a terrifying new report, there seem to be constant reminders now of the dangers that climate change poses to humanity.

David Attenborough has told the world’s political and business leaders that mankind must work together to protect the planet, telling World Economic Forum (WEF) delegates that “the Garden of Eden is no more” and that mankind must “move beyond guilt or blame” to come up with “practical solutions.”

Swedish teenage climate activist Greta Thunberg spoke to the BBC in September about her climate strike outside the Swedish parliament.

As Scotland transitions from fossil fuels to renewable energy, it is investing in an unexpected source: tidal currents.

Iremember well the first institution to announce it was divesting from fossil fuel. It was 2012 and I was on the second week of a gruelling tour across the US trying to spark a movement.

Fifteen-year-old Swedish climate activist Greta Thunberg addressed the U.N. plenary last night in Katowice, Poland, condemning global inaction in the face of catastrophic climate change.

Asheville, North Carolina, known for its vibrant culture, has also become an important hub of climate expertise.