ummm....so coming into this late, climate change and global warming are two superficially similar but actually different things. global warming may or may not occur if we keep pumping unnaturally high levels of CO2 into our atmosphere (and indeed unnaturally high levels of methane and nitrogen based gases) but climate change is definately an issue. we can't control what will happen naturally (we see cyclical warming and cooling periods over the past few millions of years) what we can control is our effects on the speed at which the levels of CO2 etc are going up - something we definitely effect. as to the original post - what technologies are out there? we currently do not have the technology to reverse what we've already done (eg destroy areas of the ozone layer) but we possess the technology to significantly reduce the carbon footprint we all have...current renewable energy sources such as off shore and inland wind farms, solar power, hyrdro and geothermal energy can all be used to create part of the power we all use. i'm not sure about seeding oceans with iron but there are other ways of reducing CO2 emissions (and storing it). One big way the UK and Eire can do this is by sustainably managing peat bogs - peat stores masses of CO2 if its forming properly - by draining and harvesting it we cause serious damage to ecosystems and releases tonnes of CO2 into the atmosphere. we ould also look to capture methane emissions from all landfills, from agriculture and we can do those things now.
that being said - does it matter whether climate change is real (i believe it is) or not? many of the things we would propose to at least minimise the effects make sound environmental and economic sense as they push us to become a more sustainable society. without these changes we're going to be unable to cope when we do run out of fossil fuels - on which we are far to dependent. we need to seek sustainable alternatives as a matter of course - and its important to look at technologies which allow us to do this - whatever that technology is.
as an aside - the building trade is all for making the buildign regs much more stringent - solar panels, grey water systems etc in every build - but the government will not pass this through as yet, which is whats holding greener builds.
sorry for all the waffle
