Even if humans are responsible for the warming of the last 50 years, there is little that can be done about it in the near term. The global demand for energy is simply too large to meet with renewable sources, which even with a bust-gut effort will only amount to about 20% of global energy needs in the coming decades.
And when new energy solutions do come, they will more likely come from the private sector, not government. Energy is needed by everyone, and energy companies are working on alternatives to fossil fuels. Traditional energy sources are indeed finite, so as they become more expensive to find and extract, prices will rise, and alternatives will be eventually developed to replace them.