As the rise of young climate activist Greta Thunberg sweeps the world, the Agenda this week talks about the environment. We speak to 17-year-old climate activist Bella Lack. We also interviewed a conservation professor about the global biodiversity crisis.

There are reportedly five-hundred times more pieces of micro-plastic in the sea than stars in our galaxy. What can be done to combat the growing number of microplastics in the world's oceans? We speak to Eleanor Church, producer of documentary 'X Trillion'.

And after bushfires in Australia burnt nearly 10 million hectares of land, Stuart Blanch from the World Wildlife Fund in Sydney, describes what this means to the country's delicate ecosystem.