1.2 million took part across 50 countries, covering 56 per cent of the world's population.
A set of photos show the Guajajara people working hard to protect the Amazon rainforest in Brazil.
We look into whether the plant-based textile is as sustainable as the fashion industry has led us to believe.
The country made some bold decisions about how to spend its money.
There are questions about whether planting trees is always the best option.
NGOs fear that tree planting often leads to "greenwashing" by corporations and governments and distracts from the real effort to stop the burning of fossil fuels.
A community-led programme in the Maya Biosphere Reserve is revolutionising how we think about conservation.
Their home in the Atlantic forest is the most endangered rainforest in Brazil.
It's not the usual place you might expect to find it.
The bio-based palm oil substitute is receiving millions of dollars from Bill Gates' investor-led fund.
Romania has been threatened with legal action over illegal logging and allegedly not doing enough to protect some of Europe’s largest unspoilt forests.
Kit Harington, Emilia Clarke or Nikolaj Coster-Waldau? Which Game of Thrones star is trying to save the Amazon?
I meet Alex Fisher, who lived in a tree for a year in the 1990s to stop British forests being cut down.