Ask the people of Yorkshire. As a result of global warming, many homeowners this week are up to their waists in muddy water. And flooding could be just the beginning of our worries. This week a paper in the British Medical Journal gave warning that climate change could be particularly damaging to the health of people in the developing world, but research also suggests that it could be bad news for Britain. Delegates at a conference in London on Tuesday will be told that global warming will drive up rates of cardio-respiratory disease, diarrhoea and insect-borne diseases such as malaria in the UK.