Unprecedented bushfires fuelled by climate change have killed at least 29 people and devastated vast swathes of the country since September.
Greta Thunberg was in the audience in the Swiss Alps to hear the typically bullish speech by Trump.
In Washington, the Senate was about to enter the heart of the impeachment trial threatening his presidency.
Business leaders will be keen to tout their awareness on climate change but are likely also to be concerned by the state of the global economy.
Australia has since October been overwhelmed by an unprecedented bushfire season made worse by climate change.
Prime Minister Scott Morrison, whose government has been criticised for its slow response to the emergency, pledged Aus$2 billion ($1.4 billion).
It is the latest emergency in Australia's devastating summer fire season, which has been turbocharged by a prolonged drought and climate change.
A total of 66 nations now have plans to be carbon-neutral by 2050.
Human-animal conflict highlighted again in drought-stricken Zambia as tourists left frozen in fear by three elephants raiding an open dining hall in a tourist lodge in search of food.
The main march will take place in Madrid on the sidelines of the UN climate conference.
Food and water scarcity caused by drought has resulted in an increase in human-animal conflict in Zambia.
How about eating a plate of E.Coli?
People gathered at the conservative Liberal party's offices to heed the call to action from 16-year-old climate change campaigner Greta Thunberg.
Methane emissions could be reduced substantially if farmers selectively reared "environmentally-friendly" cattle breeds.
China has repeatedly argued that developed nations should lead on tackling international climate obligations.
Spain's Socialist Prime Minister Pedro Sanchez offered to play host, hailing the acceptance of his offer as "excellent news".
The blazes that have scorched swathes of countryside continued to spread and the country's largest city was cloaked in hazardous smoke.
The new Pokémon game features Corsola as a ghost type Pokémon as they have been wiped out by global warming.
The Economist Intelligence Unit's (EIU) Climate Change Resilience Index measured the preparedness of the world's 82 largest economies.
A young Australian couple have volunteered to aid her in her return journey.
There is a 1 in 14,000 chance that human beings will go extinct in the coming year.
Satellite images indicate that the Taku glacier is melting 80 years faster than scientists' estimations.