From the celebration of the first Earth Day to the signing of the Paris climate agreement, we've it covered.
Let's dive in today's history!
World War I: Germans use 150 tons poisonous gas on Allied soldiers at Ypres, Belgium.
World War II: Adolf Hitler accepts defeat.
First ever Earth Day is celebrated in US
Russia's Soyuz T-8 returns to Earth.
175 nations sign Paris climate agreement at UN in New York.