Youths gathered at at the Youth Climate Summit at United Nations HQ by demanding radical moves to fight climate change.
Organisers decided to end the march after radical activists who authorities said had infiltrated the rally clashed with police.
The $158 million expedition will see scientists from 19 countries, including Germany, the US, Britain, France, Russia and China.
Hundreds of thousands of protesters in Australia, many of them children who skipped school, kicked off a day of demonstrations around the world against climate change in the run-up to a UN summit in New York.
The teenager, who is taking a year off from high school, received a standing ovation from students at The George Washington University in the US capital where the ceremony was held.
The report highlights five areas for which investment is needed most urgently: early warning systems, climate-resilient infrastructure, water resources, dryland agriculture and mangrove protection.
The protesters who took over the red carpet at the Venice Film Festival for several hours demand action to fight climate change and a ban on cruise ships entering the city.
As heatwaves and drought become more drawn out, the damage they cause to health, ecosystems, agriculture and the economy grows "significantly", scientists warn.
The administration of President Donald Trump, who rejects mainstream climate science, has a policy of rolling back regulations limiting emissions scientists link to climate change and has ordered cuts to climate science advisory panels.
The latest heatwave demonstrates that climate change is a transnational threat that requires transcontinental cooperation.
Special report by the Intergovernmental Panel on Climate Change (IPCC) warns of a connection between global warming and the way land is used for agriculture.
In a landmark report, the UN's Intergovernmental Panel on Climate Change highlights the need to protect what remains of tropical forests as a bulkhead against future warming.
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