U.S. bank Morgan Stanley reckons the rise will be due to global population growth and increasing costs for fossil fuels.

Of the main sources for alternative energy, the bank estimates that the cost of solar power may rise hardly measurable levels to 11.2 percent in 2030. Yet, the cost may decrease from $8 per Gigawatt installed in 2005 to $1.60 per GW by 2030, which is good news to homeowners and businesses wishing to install solar panels.

The bank also estimates that biofuels could grow from around 1 percent in 2005 to 21 percent in 2030, and wind power could jump from 0.9 percent to 9.6 percent in 2030.

If this projection holds true, investors will definitely profit from investing in clean tech. Deutsche Bank already has attracted more than $8.5 billion into climate change funds. Last year, global investment in renewable energies jumped to $100 billion and is expected to rise to $120 billion in 2007.