The Green Economy
Robert Pollin, the President of Pear Energy and a professor of economics at the University of Massachusetts-Amherst, has studied this matter in depth with the Department of Energy and the International Labour Organization. As his Pear Energy team writes:

“The basic facts are simple. When we invest, say, $1 million in building the green economy, this creates about 17 jobs within the United States. By comparison, if we continue to spend as we do on fossil fuels and nuclear energy, you create only about 5 jobs per $1 million in spending. That is, we create about 12 more jobs for every $1 million in spending — 300 percent more jobs — every time we spend on building the green economy as opposed to maintaining our dependence on dirty and dangerous oil, coal, natural gas, and nuclear power.”

For a visual representation and numbers for a variety of more specific sectors, check out this infographic:

Citizens Taking Action for advancement of public transit and trains
www.CTAriders.org
What is a 'green economy'? Although it is still debated, many organisations now have a shared understanding of the concept. At the most basic level, a green economy is one that generates increasing prosperity while maintaining the natural systems that sustain us. 
Each $1M Invested in Public Transit = Results in Employment for 22