Humans have had an unprecedented impact on land – with vast consequences for climate change, food systems and biodiversity, a major new UN report concludes.

It says that human activities have already altered 70% of the Earth’s land surface, degrading up to 40% of it. Four of the nine “planetary boundaries” – limits on how humans can safely use Earth’s resources – have already been exceeded.

In this article, Carbon Brief walks through five key takeaways from the UN’s milestone Global Land Outlook Report.