this is bbc news. i'm annita mcveigh, live in glasgow — as the cop26 summit — the crucial climate change conference — gets under way. a draft final communique from g20 leaders in rome commits to the key goal of limiting global warming to 1.5 degrees — and pledges action to curb the use of coal — but falls short on the zero emissions target. in glasgow, alok sharma assumes presidency of the cop26 climate change conference — and warns this "is our last, best hope" to keep global warming limited to 1.5c by the end of the century. if we act now and we act together, we can protect our precious planet.