Although it is true that there are still numerous uncertainties regarding the mechanisms by which the CO2 emitted by human activities may or may not be affecting the earth's climate, groups of highly dedicated people such as the IPCC have given us pretty convincing evidence that "climate change" is already happening. In fact, from looking at the mechanisms behind the formation of the vastly different atmospheres of our neighboring planets - Mars and Venus (see the reference to the book "Vision 2050" given below) - there is little question in my mind that climate change is a reality.

So, the quick answer is that climate change cannot be prevented - it is already happening. Plus, once the CO2 in the atmosphere builds up, it can take a long time to return to normal - remember that we are talking about a possible doubling of CO2 in the atmosphere.

Measures to deal with climate change are often divided into two types: "mitigation" measures to prevent CO2 from accumulating in the atmosphere or to reduce or remove CO2 already in the atmosphere, and "adaptation" measures to lessen the adverse effects of a large accumulation of CO2. Deep sea CO2 sequestration, along with energy conservation and CO2 neutral energy technologies, are examples of the first type. Geoengineering, as well as smaller scale measures such as building sea walls and developing technologies like reverse-osmosis for desalinating sea water, are examples of the latter - measures to lessen the effects of climate change.

The IPCC Fourth Assessment Report (AR4) Working Group II Report "Impacts, Adaptation and Vulnerability" gives a detailed analysis of the things that can be done to lessen the wide range of predicted effects of climate change, by sector (water resources, ecosystems, human settlements in coastal and island regions, etc.) and by region. The full report is rather long (chapter 17 is the one to read). Pages 19 and 20 of the Summary for Policymakers lists several ways to lessen the effects of climate change that are or could be taken.
Source(s):
Vision 2050 - chapter 1 pages 22-24
http://www.springerlink.com/content/g5518444wp0n62lh/fulltext.pdf

Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change
http://www.ipcc.ch/publications_and_data/publications_ipcc_fourth_assessmen...

Summary for Policymakers
http://www.ipcc.ch/pdf/assessment-report/ar4/wg2/ar4-wg2-spm.pdf

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