Field tests with tobacco plants showed an increase in production of up to 40 percent.
President Donald Trump claimed that the "yellow vests" were protesting the Paris climate agreement, but the reality was much more complex.
"Young people are at the forefront of leading solutions to address the climate crises, and we won't back down."
"For many people, regions [and] even countries, this is already a matter of life and death."
On climate change, Trump added: "One of the problems that a lot of people like myself, we have very high levels of intelligence but we're not necessarily such believers."
"Modeling the climate is an extremely complicated science that is never exact," the White House press secretary told reporters on Tuesday.
The president brushed off a report that said climate change would cost the U.S. billions and billions of dollars. That's not entirely surprising.
The president appeared to confuse the concepts of weather and climate.
In an interview with Chris Wallace, the president said firefighters were raking leaves.
President Donald Trump called French President Emmanuel Macron's plan to create a united European army "very insulting."
New York Democratic congressional primary winner Alexandria Ocasio-Cortez compared the "existential threat" posed by climate change to that of Nazi Germany during World War II.
"It's going to be challenging, obviously," the Arizona senator said. "That report that came out is pretty dire."
"I think we're still exploring all of that," Larry Kudlow said about how much of climate warming is due to human activities. Ninety-seven percent of climate scientists say human activity is the cause.
As temperatures increase and changes in rainfall patterns continue, crops such as rice, wheat and corn will fail to meet demand.
"It's urgent that we act to curb climate change—and Brett Kavanaugh on the Supreme Court could make progress virtually impossible."
"I'm not going risk my life to catch your flight!" one passenger wrote on Twitter, after Hurricane Lane reached Category 5 in the Central Pacific.
The California governor is lauded as an environmental firebrand. But there's something hinky about Brown's climate leadership, an inconsistency that could threaten his legacy.
"I've heard the climate change argument back and forth. This has nothing to do with climate change. This has to do with active forest management."
So far this month, 120 human cases of the disease have been reported across the EU.
Belgium's drought has approached record levels, and it is hitting the region responsible for bringing a major part of its festive spirit.
Climate change is making hurricanes stronger and threatening the future of the Caribbean islands.
Activists see move as a significant step in efforts to slow environmental degradation.
Tony Abbott, now a member of Parliament, told a group of climate change deniers Tuesday that Australia would not have joined the treaty without the United States.