Imagine the world's ecosystem is an unstable tower of wooden blocks that has been chipped at for decades.

What happens if we lose a pivotal block, such as the ocean or Amazon rainforest?

On this episode of Sky News ClimateCast hosts Anna Jones and Katerina Vittozzi discover how oceans and rainforests are our biggest allies in the fight against climate change.

They're joined by tropical forest ecologist Dr Erika Berenguer and marine biologist Dr Asha De Vos, to ask how we can protect our ecosystems from reaching a tipping point.