Syria told the U.N. climate talks in Bonn on Tuesday that it would join the Paris Agreement, leaving the United States as the only nation in the world opting to stay outside the landmark treaty.

A public health emergency was declared in New Delhi Tuesday as a choking blanket of smog descended on the world's most polluted capital city.

Confronted with a cascade of grim reports on the gathering pace of global warming, climate negotiators meet in Bonn Monday wondering to what extent US President Donald Trump will make their jobs more difficult.

Five months after the world's most famous climate sceptic said he would yank the United States out of the 196-nation Paris Agreement, the diplomats and leaders tasked with implementing it remained both defiant and concerned.

Renewable energy continues to grow in the United States, despite US President Donald Trump's moves to dismantle clean power, deregulate industry and promote fossil fuels like coal, experts say.

On December 12, 2015, 195 countries gathered in the French capital to conclude the first truly universal climate treaty, the Paris Agreement, aimed at preventing the worst-case scenarios of global warming.

Under a scorching sun, a team of British soldiers and Malawian rangers sheltered under a tree ready to pounce on their prey: poachers.

State agents and energy company executives participated in the murder of a Honduran environmentalist who opposed the building of a power plant on indigenous land, international experts said Tuesday.

The murder of Berta Caceres, 45, gunned down last year, highlighted the threat to Honduran activists and sparked international outrage.

There is a "catastrophic" gap between national pledges to reduce greenhouse gas emissions and the actions needed to cap global warming below two degrees Celsius, the U.N.'s environment chief warned Tuesday, days ahead of global climate talks in Bonn.

Even if fulfilled, these pledges -- inscribed along with the 2 C target in the 2015 Paris climate pact -- would see the world heat up 3 C (5.6 F), unleashing deadly heatwaves, superstorms and rising seas, U.N. Environment said in its annual Emissions Gap report, the bleakest ever. 

The U.N. weather agency is warning that carbon-dioxide concentrations in the atmosphere increased at record-breaking speed last year.

World Meteorological Organization Secretary-General Petteri Taalas says rapid cuts to CO2 and other greenhouse gases are needed to avoid "dangerous temperature increases" by 2100 that would far surpass targets set in the Paris climate accord.

Facing 195 other countries who have chosen a different path, the task of US negotiators at upcoming climate talks in Bonn is unenviable.