I don't think it's a massive leap to say that human industrial activity has increased the carbon dioxide level in the atmosphere significantly and this will have an effect on the climate and it's entirely reasonable to suggest we should look at ways of reducing our carbon dioxide emissions. Not at the cost of industrial or economic activity or the minimum technological advances we enjoy at the moment.
The Earth's climate is notoriously difficult to second guess, especially when you're only looking at it over a very, very short time scale (since the industrial revolution). The climate has always 'changed' and always will continue to change. It hasn't always spelled disaster in the past and there's no reason to assume it will spell disaster for humans in the future.
Finding new resources to fuel the life we've all grown accustomed to is far more important than lowering carbon emissions, although that isn't to say we shouldn't give a toss about trying to do that latter.