tonight at 10, a code red for humanity — the un's stark warning on climate change. its landmark report says human activity is changing the climate in unprecedented and sometimes irreversible ways. the world listened, but didn't hear. the world listened, but it didn't act strongly enough and as a result of climate change, it's a problem that is here now. nobody is safe and it's getting worse and faster. raging wildfires in greece — one of many countries already feeling the impact — the flames fanned by strong winds and rising temperatures. the warning comes as the uk prepares to host a key climate conference — cop26 — in november. also tonight. documents obtained by the bbc