“The renewable energy market is highly competitive and fragmented, returns on investments are typically lower than in oil and gas, and the average investment is much smaller in size,” says consulting firm Wood McKenzie. “The Majors may want to look towards mergers and acquisitions, developing offshore wind, or solar PV in emerging markets, in order to find a competitive edge and be able to deploy sufficient capital to grow in the sector.”
To conclude that Big Oil has reached an epiphany would be faulty. But it is an explicit recognition of green energy’s role in the New Energy Economy while it is also serving to restrict the industry’s antipathy toward climate causes. Norway’s sovereign wealth fund is a prime example of a market mover shedding riskier investments and acquiring newer and cleaner ones in the name of diversification and good governance. If the oil companies continue to invest in green energies and clean technologies, those projects would attract more capital and proliferate worldwide. [Source]
The reason returns on investment are as high as they are is because those industries are not being charged for the negatives they are producing in the form of pollution and other damage. With the youth coming up being bent upon cleaning things up, I wouldn't risk their wrath.