Deforestation: Which countries are still cutting down trees?
World leaders at the COP26 climate summit in Glasgow have pledged to end and reverse deforestation by 2030.
There have been other attempts to protect forests, but has any progress been made?
How bad is deforestation now?
Forests absorb vast amounts of carbon dioxide (CO2) - a major contributor to global warming - so cutting down trees can have a big impact on climate change.
The UN says 420 million hectares (one billion acres) of forest have been lost since 1990. Agriculture is the main reason for this.
There have been efforts to protect forests before.
In 2014 the UN announced a deal to halve deforestation by 2020 and end it by 2030.
Then, in 2017, it set another target to increase forested land by 3% worldwide by 2030.
But deforestation continued at "an alarming rate", according to a 2019 report, with serious consequences for the fight against climate change.
There has been some reforestation, through natural growth or planting, but trees need years to mature before they can fully absorb CO2.
Over the past decade 4.7 million hectares of forest were still lost annually - with Brazil, the Democratic Republic of Congo and Indonesia among the countries worst affected.
Brazil: Illegal logging continues
Some 60% of the Amazon rainforest is in Brazil, and it plays a vital role in absorbing harmful CO2 that would otherwise escape into the atmosphere.
After falling steadily since 2004, deforestation in Brazil's Amazon has risen again, according to the country's National Space Research Institute (INPE). It said in 2020 that the deforestation rate was its highest in more than a decade.