We are in a global climate change emergency. Annual ice loss is at an "unprecedented" rate, and this summer, the Amazon rainforest, often dubbed as the "Earth's lungs", has been ravaged by fire.
Now, people all around the world are taking action in an attempt stop the crisis before it's too late, and one of the loudest voices in the movement is that of 16-year-old Greta Thunberg.
At the UN climate summit, she blasted world leaders for their lack of action before glaring at President Trump:"People are suffering, people are dying, entire ecosystems are collapsing. We are in the beginning of a mass extinction and all you can talk about is money and fairy tales of eternal economic growth," Thunberg said.
"How dare you continue to look away and come here saying that you're doing enough when the politics and solutions needed are still nowhere in sight," she continued. "You say you hear us and that you understand the urgency, but no matter how sad and angry I am, I do not want to believe that. Because if you really understood the situation and still kept on failing to act then you would be evil and that I refuse to believe."
And when the teenager spotted President Trump, who famously said that climate change was a hoax invented by the Chinese, she gave him quite possibly the most terrifying death glare in history:
In response to this, the 45th president of the United States commented on the teenager on Twitter.
"She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!" Trump posted alongside a video of the 16-year-old's speech.
Then, she slammed Trump again, simply by quoting his tweet in her biography:
Greta, who has been open about her Aspergers diagnosis, said that her condition has helped spur on her mission to reverse the climate change emergency.
"My diagnosis has definitely helped me keep this focus. When you are interested about something you just continue to read about it and you get super focused," she told CNN's Bill Weir.