Greta Thunberg, 16, arrived in New York to attend a UN summit by sailing a carbon-free boat across the Atlantic instead of flying there due to the carbon emissions of planes. /VCG Photo

The teenager's action triggered a series of student protests against the lack of action against climate warming. /VCG Photo

Thunberg urged people to tackle climate change together and take action before it's too late. /VCG Photo

The young environmental activist also sent a message to U.S. President Donald Trump, knowing he has denied climate problems -- "listen to the science", according to the Guardian. /VCG Photo