"#Regram #RG @gretathunberg: "'Right here, right now is where we draw the line. The world is waking up. And change is coming, whether you like it or not."' My full speech in United Nations General Assembly. #howdareyou Swipe for full video," the Hollywood star wrote on Instagram.

Leonardo, his foundation and a climate connection:

According to the foundation's website,  in 1998, Leonardo DiCaprio established his foundation with the mission of protecting the world’s last wild places.

LDF implements solutions that help restore balance to threatened ecosystems, ensuring the long-term health and well-being of all Earth’s inhabitants.

Since that time the Leonardo DiCaprio Foundation (LDF) has worked on some of the most pressing environmental issues of our day.  

"Through grantmaking, public campaigns and media initiatives, LDF brings attention and needed funding to six program areas -- Wildlands Conservation, Oceans Conservation, Climate Change, Indigenous Rights, Transforming California, and Innovative Solutions.. Several successful fundraising events have enabled LDF to scale up our grantmaking strategy, driving support for vitally important projects around the globe," read the website.

How Dare You:

A hashtag #HowDareYou has been trending online ever since Greta delivered her speech. Actually, the catchline started delivering after she fired questions at world leaders for destroying climate at such a rate.

She questioned world leaders time and again by posting her messages online with the hashtag that read: "How Dare You."

She even shared a video of her speech with the caption that read: "'Right here, right now is where we draw the line. The world is waking up. And change is coming, whether you like it or not.' My full speech in United Nations General Assembly. #howdareyou."

What did Greta say at UN's Climate Action Summit:

Speaking at the beginning of the UN’s Climate Action Summit on Monday, the 16-year-old acclaimed climate activist Greta Thunberg, was unsparing in her criticism of world leaders, telling them that they are still “not mature enough to tell it like it is”.

The eyes of all future generations are upon you, and if you choose to fail us, I say, we will never forgive you. Greta Thunberg, Climate Activist

She added, bluntly, “you are failing us, But the young people are starting to understand your betrayal. The eyes of all future generations are upon you, and if you choose to fail us, I say, we will never forgive you."

Thunberg was speaking directly to dozens of Heads of State and Government, business leaders, and senior representatives from civil society from around the world, who lined up to promise far-reaching steps to beat climate change, at the day-long event, held at the Organization’s New York headquarters.

The build-up to the Summit has included the latest scientific report of potentially catastrophic global warming, unprecedented demonstrations for climate action, and a steady drumbeat of pressure from the UN Secretary-General, who demanded that world leaders come to New York with “bold action and much greater ambition”. Launching the Summit, he added “We have had enough talk. “This is not a climate negotiation summit. You don’t negotiate with nature. This is a climate action summit.”