He perceived the development of alternative energy sources as the most pressing problem in the nation at the time.

Their ability to efficiently create biomass may become important to the development of alternative energy sources.

More recently, the development of renewable energy sources, especially offshore wind power, has created further opportunities for support services.

"This is a way for people to help foster the development of renewable energy sources," he said.

Since then, there has been rapid development of new renewable energy sources.

Lawmakers have also shown little interest in the development of alternative energy sources.

Nor has the Administration pushed development of alternative energy sources, as the academy urged.

It also has a significant bearing on the economy and is linked to the development of renewable energy sources.

I support the development of new technologies and especially renewable energy sources.

It has to be said that we have at our disposal nearly all the necessary technology for the development of renewable energy sources.