Jeremy Hunt (South West Surrey, Conservative) I am pleased to follow the hon. Member for Wolverhampton, South-West (Rob Marris), because I want to echo what he says about the dangers of cosy consensus. We have had a lot of consensus in the Chamber this afternoon, but that is easy to achieve when we talk only about what the problem is and much harder if we take the difficult step of talking about what the solutions might be.I do not want to break the spirit of consensus, because it is important that parties work together on this issue. I pay tribute to the Government for moving it up the agenda, particularly at the Gleneagles summit last year, but they have given us precious little detail as to how we are going to meet the 60 per cent. reduction by 2050. That is a matter of great concern to me. I come from a constituency that includes the town of Godalming, which was the first town in the world to have a public supply of electricity back in 1881. Interestingly, at that time public transport used biomass as its fuel; now, 125 years later, we are coming round to seeing that that might not have been such a bad thing.We have consensus in two areas but not in a third. We have consensus about the scale of the climate change that is happening. The Secretary of State said that there is more carbon dioxide in the atmosphere now than there has been for 750,000 years. I have heard scientists say that it is more like 40 million years. Whichever it is, there is a huge amount of CO2 in the atmosphere, on a scale as never before. NASA scientists say that the earth is warmer than it has been for 1,000 years and within 1° of being warmer than it has been for 1 million years. That results in several of the effects that the hon. Member for Wolverhampton, South-West talked about, such as desertification in Africa, the melting of the ice caps and of permafrost, and global dimming.There is, too, a relative degree of scientific consensus about what will happen if we carry on as we are: the amount of CO2 in the atmosphere will increase from 380 parts per million towards 1,000 parts per million as a result of the industrialisation of China, India and so on. There is a danger that 50 million to 100 million people could be displaced, mainly in the poor parts of the world, following the disappearance of islands and countries.The difficult question is what we should do about it. Today, Shell published a projection that it would cost £4 billion a year to deal with the effects of climate change in a way that would meet our 2050 target of reducing emissions by 20 per cent. That is a lot of money, but it is less than a third of 1 per cent. of our gross domestic product. That is a tiny price to pay for dealing with the sheer unpredictability of messing around with our natural environment on the current scale. We have to be brave and accept that there will be costs to pay.Another significant change in this debate concerns my party. Under the leadership of my right hon. Friend the Member for Witney (Mr. Cameron), the Conservative party has made climate change and the environment one of the issues that is right at the top of our agenda. I like to think of it not as Saul having a conversion on the road to Damascus but as a reaffirmation of our traditional beliefs in conservation of the environment, and in not only a green and pleasant land but a green and pleasant planet. That is important because the Conservative party has traditionally understood the importance of wealth creation as an engine of change in society and fought against over-regulation of business.If ever there was a ""Nixon goes to China"" moment in the environment debate, it is now. It means that there is now no excuse for the Government not to introduce a climate change Bill. We need to see details of how we will meet the 2050 target. The Government are good at long-term targets. We had the 2050 target for reduction in CO2 emissions, a 2025 target for equality of respect for disabled people and the 2015 millennium goals, to which we are all signed up. They are important, but they could be described as NIMTO—not in my term of office—goals. If we are to make progress, we need targets that apply to all our terms of office. There is no excuse for not introducing a climate change Bill and starting the national debate about what we are going to do. I urge the Government, for the sake of all our futures, to take that opportunity.