Well, first of all, I have to say that the effects of Climate HChange will vary greatly, depending on what happens. If there is no warming effect and it starts cooling down, then we are in for an ice age and no one is prepared. If it warms, there will be more heat waves and more erratic weather. Truthfully we don't know much about our climate and what will happen if it changes. But the one thing we do know, is that, the climate has changed before and we are powerless to stop it and powerless to change it. And in regards to illnesses, it depends on the weather. And it may not be that we are more prone to illnesses because the weather will not permit it, especially if it is erratic weather, because it's pretty hard to get skin cancer in torrential downpour. And heatstroke is something for people who are to stupid to drink water and keep in the shade and stay cool when it's hot.
And by the way, I'm a non-believer, saying non-believers are afraid of illnesses, etc.. is incorrect and stupid. I don't believe in the whole theory because of the junk science surrounding it. If you want to see why many people deny it, read The Deniers by Lawrence Solomon, it has scientific facts from scientists who are in the top of their fields, not ones who just got ourt of school with a fresh phD in hand, like Michael Mann (author of hockey stick graph).
Also, government organization can not be trusted with the facts, as they have an agenda, and these people with agendas, especially the UN, are dangerous as they will twist and bend the truth to their liking. Oh and Adam, sorry, but the WHO is a part of the UN, which has the most scientifically corrupt group of all, the IPCC. And, as the IPCC have an agenda, so does the WHO and the rest of the UN.