The United Nations says the world will pass its most important climate target within a few years. So can we bring the planet's temperature back down quickly? Or will the damage be irreversible?

In 2015, world leaders agreed in Paris to try to keep the global temperature below 1.5 degrees above pre-industrial levels to avoid the worst effects of climate change.

But the UN now says what scientists call "overshoot" is guaranteed, and it may have devastating consequences.

Experts are worried that the higher temperature may trigger "tipping points" in vital parts of our planet's climate system, including coral reefs, glaciers, rainforests and ocean currents.

Once past their tipping points, they could flip from helping to keep the Earth cool to making it even warmer.

In this show, The Climate Question hosts Graihagh Jackson and Jordan Dunbar talk to Johan Rockström, Director of the Potsdam Institute for Climate Impact Research

Producers: Simon Watts, Melanie Stewart-Smith and Diane Richardson Sound Mix: Tom Brignell and Phil Bull Editor: Simon Watts