It's time for more than 130 world leaders to feel the heat.

They will traipse to the podium Monday and Tuesday at crucial international climate talks in Scotland and talk about what their country is going to do about the threat of global warming. From U.S. President Joe Biden to Seychelles President Wavel John Charles Ramkalawan, they are expected to say how their nation will do its utmost, challenge colleagues to do more and generally turn up the rhetoric.

Fires raged. Rivers flooded. Ice melted. Droughts baked. Storms brewed. Temperatures soared. And people died.

Climate change in 2021 reshaped life on planet Earth through extreme weather.

World leaders have been meeting for 29 years to try to curb global warming, and in that time Earth has become a much hotter and deadlier planet.

Trillions of tons of ice have disappeared over that period, the burning of fossil fuels has spewed billions of tons of heat-trapping gases into the air, and hundreds of thousands of people have died from heat and other weather disasters stoked by climate change, statistics show.

President Joe Biden has wrapped up his time at the Group of 20 summit trying to convince Americans and the wider world that he's got things under control — and taking Russia, China and Saudi Arabia to task for not doing enough to deal with the existential threat of climate change.

Biden's overall take on his efforts: On climate change, he's got $900 billion planned for renewable energy, and Congress will vote this coming week. On supply chains, he has plans to make the ports run better and tamp down inflation. For workers, he's building an economy with pay raises. On diplomacy, world leaders trust him.

Climate change and the relaunch of the global economy will top the G20 agenda as leaders of the world's most advanced nations meet Saturday, the first in-person gathering since the pandemic.

The U.N.'s top human rights official and U.S. President Joe Biden's climate envoy called Thursday for countries to step up the fight against global warming, describing it as an issue of sheer survival for humankind.

In a statement ahead of the U.N. climate summit in Glasgow, the global body's High Commissioner for Human Rights said "only urgent, priority action can mitigate or avert disasters that will have huge — and in some cases lethal — impacts on all of us, especially our children and grandchildren."

Protesters started gathering Friday in the heart of London's historic financial district to lobby against the use of fossil fuels ahead of the start of the U.N. climate summit in the Scottish city of Glasgow.

The protests in London, which were to be joined by Swedish climate activist Greta Thunberg, are part of a worldwide day of action before leaders head to Glasgow for the U.N. Climate Change Conference, known as COP26. Many environmentalists are calling the Oct. 31-Nov. 12 gathering the world's last chance to turn the tide in the battle against climate change.

More than one world leader says humanity's future, even survival, hangs in the balance when international officials meet in Scotland to try to accelerate efforts to curb climate change. Temperatures, tempers and hyperbole have all ratcheted up ahead of the United Nations summit.

And the risk of failure looms large for all participants at the 26th U.N. Climate Change Conference, known as COP26.

The European Union's chief executive called Thursday for a show of climate leadership ahead of two major international meetings focused on curbing global warming, warning that world leaders face "a moment of truth."

"What we need is, first of all, leadership," European Commission President Ursula von der Leyen said before she heads to a weekend summit in Rome of the Group of 20 most developed nations. The 26th U.N. Climate Change Conference, known as COP26, starts Sunday in Glasgow, Scotland.

Australia on Thursday ruled out promising to cut methane emissions by 30% by the end of the decade in a stance that will add to criticism that the country is a laggard in addressing climate change.

Minister for Industry, Energy and Emissions Reduction Angus Taylor announced his government's decision before he was to fly with Prime Minister Scott Morrison to a U.N. climate summit in Glasgow, Scotland.