英文翻译：寻找一种既节能又环保的新能源是迫切需要解决的问题。

finding/seeking a kind of energy source which is low in consumption and environmental friendly is an urgent issue

looking for a new energy-saving and environment friendly energy sources is an urgent issue to be settle.

It's an urgent problem to solve to find an energy-saving and environmentally-friendly alternative energy.

Finding a new form of energy that is both energy-saving and environment friendly is a urgent issue that we need to solve.

Seeking one kind of both energy conservation and environmental protection new sources of energy is to need the problem solving urgently.