Ed Miliband replies
The Secretary of State for Climate Change, Ed Miliband, said he would answer some of your questions, and he has.
Wolfgirl asked: Does Mr Miliband offset any of his personal emissions? If not, why not? Does he think that offsetting emissions can help us to tackle climate change?
"The first thing I do is look to reduce my emissions. So I take the train and have taken steps to reduce the energy I use in my home.
"Carbon offsetting is not a cure for climate change, but it can help raise awareness and reduce the impact of our actions.
"Offsetting can be useful when we need to compensate for unavoidable emissions. In this way, offsetting can play a useful part in helping to meet carbon reduction targets.
"Robust offsetting projects can, however, provide a route for investment in clean technology in the areas which lack it the most. This investment really does help lead to the spread of low-carbon development across entire regions.
"The government is becoming increasingly aware of the environmental impact of travel by our ministers and officials. That's why we have offset all our emissions from air travel since April 2006."
MrWaves asked: Given that so many technologies such as wave, tidal, carbon capture and large scale solar are still in their infancy, how will we grow at least some of these into worthwhile energy sources and how do we plan with so much uncertainty?
"Wave and tidal energy and clean coal have enormous potential, and I'm proud that the UK is seen as a world leader in the development of these cutting-edge technologies. All are going to be necessary, we can't pick and choose.
"We are working closely with industry to develop these technologies that aren't yet commercially viable. That's the government taking a strategic role in helping that technology along.
"Just last week we published our new clean coal policy - which is the most environmentally ambitious set of coal conditions of any country in the world. It says that there will be no new coal without carbon capture and storage.
"Our island nation also means we've got huge potential in the area of wave and tidal energy and there's loads of work already underway. We've recently made £22m available to developers to accelerate the commercial development of marine energy in the UK. Work began this month on a 'Wave Hub' in south-west England which will help developers test their designs, and we have a £50m Marine Deployment Fund for the projects once they are ready for commercial testing.
"So we are putting the measures in place to develop these technologies - which will all be vital as we decarbonise our energy supplies."
DocDim asked: Does Mr Miliband see such initiatives as Copenhagen as having more or less value than actions taken by individuals, such as assuming a suitable moral stance (intrinsically motivated) as opposed to one decreed by governments (extrinsically motivated)?
"The bottom line for me is that politicians and governments have got to take a lead in sorting the problem out, and that's where Copenhagen comes in. We can't afford for any country to be left out, or left behind. And the UK has been pushing really hard to get the most ambitious deal possible.
"But 'Doc Dim' is right to bring up the role of individuals. Individuals all over the world have and must continue to play a vital role in mobilising and putting pressure on their governments to do the right thing when it comes to the climate.
"There's also the simple things that we can do in our homes - we're all part of the solution. Some 40% of the UK's emissions are down to what we do in our personal lives - transport, heating, power use. It would be wrong - and impractical - for government to just leave it at that, and say 'it's over to you and it's your responsibility'.
"Governments should make sure that we put in place the measures and help so that people play their part in tackling climate change, find it easy, and that it doesn't cost too much. That's what we're doing through our pay as you save home insulation pilots, to the new clean energy cash-back schemes for people who start to generate their own energy.
"Personally, I think it's not a good idea for politicians to lecture the public. It's my role to communicate a message of optimism and hope - not a message of gloom and defeatism."
Brightyangthing asked: If a means of power generation for the future had to be 'in your back yard', and assuming that without it, you would have no domestic heating or lighting three days a week, which box would you tick: Wind farm, Coal-fired power station, Nuclear, Other?
"Firstly, no-one is going to have a nuclear power station or a coal power station in their back yard - there's pretty strict rules on where they get built, as you'd expect!
"But people's back yards could be great for small-scale technology such as a ground source heat pump or solar panels. And from next year, through the clean energy cash-back scheme, people are going to be able to produce their own clean energy in their back yard and get paid for doing it as well.
"In my local area of Doncaster, we already have a coal power plant which could be one of the first in the world to develop CCS, and there are plans to build wind farms too.
"But we need all kinds of energy technology across Britain - in the right places - to supply us with the secure low carbon energy we need in the future. And we shouldn't forget the jobs and economic benefit that this investment brings to each area."