The field of environmental journalism is now one of the most dangerous after war reporting. The investigative reporter Juliette Garside and the global environment editor, Jonathan Watts, discuss why journalists are facing rising levels of violence. And: Polly Toynbee on Jeremy Hunt and Boris Johnson making it to the final in the Tory leadership race

Over the past decade, 13 journalists who were investigating damage to the environment have been killed and many more have suffered violence, harassment, intimidation and lawsuits. The Committee to Protect Journalists, which produced the tally, is investigating a further 16 deaths. It says the number of murders may be as high as 29, making this field of journalism one of the most dangerous after war reporting.

The Guardian investigative reporter Juliette Garside and the global environment editor, Jonathan Watts, talk to India Rakusen about their work on Green Blood: an investigation, led by Forbidden Stories, exposing how journalists reporting on environment issues across the world are being harassed, jailed and killed for trying to expose the truth.

And: the Guardian political commentator Polly Toynbee reflects on Jeremy Hunt and Boris Johnson making it to the final in the Tory leadership race