Unfortunately the market is not perfect. The market often fails to develop industries that may be of significant benefit to local, national or global communities. Markets often also impose significant costs on the world community during economic downturns, such as the financial and economic crisis recently generated in the United States, and there is no private sector mechanism to respond to terrorist attacks such as 911 in the United States. Without government support, the market fails to address many important issues such as climate change, air pollution, water pollution, health, national defence and poverty.
Market failures however, can be corrected by government support measures such as regulation, taxation, incentives, and on occassion, such as the recent financial meltdown in the United States, to partner with private industry to correct market failures. Climate change and the development of clean energy industries is one issue where government can regulate, tax, provide incentives, and work in partnership with the private sector.
Governments are often ridiculed by ideological extremists who argue for individual freedom and private initiative, claiming all governments are incompetent, should not be involved in economic decision making, and should leave everything to the private sector. These extremists are too often caught up in meaningless ideologies, and not focused on "what works". Unfortunately, when elected, extremists driven by this type of ideology often do nothing, and prove by their own inactions that governments are indeed incompetent.
Strong, ethical and effective governance at the political level is as critical as it is in the corporate boardroom. Incompetent, corrupt and unethical governance in both, which has been too prevalent in the US for example, in the last decade, is a recipe for disaster, as evidenced by the financial meltdown.