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Professor Steve Evans calls himself "an angry environmental optimist". Angry because he feels we are borrowing from the future, but optimistic because many of the problems with regard to the environment are perfectly solvable.

"We have reached clean energy parity," he says. "Renewable energy is not just cleaner than other forms; it is now cheaper."

Professor Steve Evans calls himself "an angry environmental optimist". Angry because he feels we are borrowing from the future, but optimistic because many of the problems with regard to the environment are perfectly solvable.

"We have reached clean energy parity," he says. "Renewable energy is not just cleaner than other forms; it is now cheaper."

It may be difficult to be an environmental optimist in the current global set-up, but Professor Evans, Director of Research at the Institute for Manufacturing, argues that green energy is now better in every way than the alternative - including by the standards of the free market.

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