http://climateprogress.org/2009/02/19/obamas-first-month-31-days-that-made-and-may-remake-history/
Alternative question: Same question as the above, but "as compared with a plan that specifically targets carbon emissions, such as a carbon tax or a flexible cap and trade system".
1) He began the process of blocking the vast majority of new coal plants.
This one is huge, because we still have very large coal reserves, and if we continue to burn them there’s little to no chance we’ll avoid catastrophic climate change. Very effective.
2) He unleashed his Cabinet to start inconvenient-truth telling to the public after 8 years of Administration denial and muzzling of U.S. scientists.
Very important because 41% of Americans think the media is exaggerating global warming. Since the media is actually very conservative on global warming, this means the American public really doesn’t understand the importance and danger of the issue, and in order to pass political measures, you need public support. You can’t get a carbon tax or cap and trade system if the public doesn’t support it.
3) He began the process to dramatically increase the efficiency of our vehicles
Effective since over 20% of US GHG emissions come from cars.
http://cait.wri.org/figures.php?page=US-FlowChart&view=100
4) He signed into law the tax credits needed to achieve his ambitious goal of 1 million plug-in hybrids by 2015
Effective for the same reason as #3 and because the more a vehicle relies on electric motors (and less on internal combusion engines), the more efficient it is.
5) He signed into law a massive investment in high-speed rail, mass transit, and train travel.
Important because recently American use of public transportation hit its highest level in 52 years, and our mass transit systems are just terrible.
http://www.washingtonpost.com/wp-dyn/content/article/2009/03/08/AR2009030801960.html
6) He signed into law the tax credits needed meet his ambitious goal of doubling renewables in his first term.
Very effective because 50% of US energy comes from burning coal. It’s critical that we increase our renewable energy production.
7) He signed into law the funding needed to jumpstart a 21st smart grid
Very important for increasing efficiency and enabling the large-scale adoption of electric vehicles.
He signed into law the single biggest investment in the deployment of energy-efficient technology in U.S. history
Energy efficiency is also critical for reducing carbon emissions. In fact, it’s by far the cheapest way to do so.
http://climateprogress.org/2008/07/27/energy-efficiency-part-3-the-only-cheap-power-left/
9) As noted above, for the first time in three decades, he more than doubled the annual budget for advanced energy efficiency, renewable energy, and low carbon technology
Clearly critical to fund technologies which will reduce carbon emissions.
Overall, I think these are very effective measures. As for the alternative question, a carbon tax or cap and trade system would be more effective, but it’s a seperate issue which is also being currently worked on.
http://climateprogress.org/2009/02/25/reid-cap-and-trade-bill-is-third-in-line/