Public health and environmental experts say "there's nobody watching" U.S. oil and gas companies along with other leading pollutant operations after the industry complained about being unable to do business during the lockdown.
Studies show emissions have risen by almost 10 percent in the last 20 years.
However, researchers warn that the recent drastic falls are only likely be temporary.
The state of California does not wait for this, or any, president's permission to protect the planet.
From the single best thing you can do to help the climate, to how long the planet is going to last.
The company plans to employ 2,000 more workers to focus on technical development.
If growth continues, it could negate or reverse any gains made by reducing carbon dioxide emissions.
Scientists warn that human emissions could reach a level not seen for 55 million years by the 22nd century.
The pro-fossil fuel U.S. event will take place as world leaders work to cap emissions and prevent "catastrophic" global warming.
"Change is coming whether they like it or not," said Greta Thunberg.
"The continuation of civilizations and the natural world upon which we depend is in your hands," Attenborough told leaders.
"We all know we are going to go at some time or other but we don't want to be reminded," one resident said.
The report comes two years after the Paris Agreement, where nations agreed to try to limit global warming to 1.5℃.
Long-term benzene exposure can lead to multiple health conditions, including leukemia.
Patricia Espinosa said this year's extreme weather events "make the evidence clear that climate change is having an impact on the daily lives of people."
Andrew Wheeler champions the deregulation of national automobile fuel economy and greenhouse gas standards for all new automobiles produced in the U.S.
"It's the Trumps and the Kushners that are polluting this city," an environmental group head said.
Amazing aerial photos of thousands of old Volkswagen and Audi diesel vehicles in the desert.
But it can still be saved, scientists said.
"My conversations with Donald Trump continued after he went into the White House, and I had reasons to believe he would stay in the Paris agreement," Al Gore said.
India's prime minister, Narendra Modi, and foreign minister have dismissed Donald Trump's comments that India signed the Paris deal to receive "billions and billions and billions of dollars in foreign aid from other nations."
High levels of dangerous pollution have stabilised in China, but are rising sharply in India and Bangladesh.