disease, A. If we hadn't invented antibiotics, it's possible that we might have died out by now. And if we don't develop new ones soon, it won't be long before the existing ones become ineffective., famine, B. I wouldn't give money to charity unless I thought it really made a difference. There's enough to go round, global warming, C. The signs have been there for a long time; even if we'd done something about it sooner, it would still be a threat - not just to our climate and landscapes, but to the future of the entire planet., nuclear weapons, D. I'm worried about how many countries have got them now; we might have destroyed the whole world if there'd been a war in the '80s. And supposing they got into the wrong hands, it could still happen.

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