The Terminator actor also says reducing meat intake does not have to mean sacrificing something.
A sample of the Native American leader's hair confirms the identity of his great-grandson.
From planes and trains to insulation - this is how green the Budget looked ahead of COP26 starting on Sunday.
Human activity and wildfires have turned highly protected forests into net sources of carbon, a study suggests.
Ahead of COP26, a BBC World Service poll finds growing support for strong political leadership.
A new chapter in physics is here, says a team that hunted for a key building block of the Universe.
The Chancellor boosts science spending to 20bn a year by 2024 - 2bn less than he previously pledged.
The activists say they will stay at London's Science Museum for "victims" of fossil fuel sponsors.
Current carbon-cutting plans from nations would lead the world to climate catastrophe, says the UN.
The government must cut demand for flying and meat under plans to curb climate change, experts say.