>for an offshore wind turbine 0.57 years of expected average energy production are necessary to recover all the energy consumed for manufacturing, operation, transport, dismantling and disposal https://www.wind-energy-the-facts.org/energy-balance-analysi...
Not so sure about this one: https://www.theguardian.com/environment/2017/mar/22/coal-pow...
Sure they are still building but at a rate that has been drastically shaken up by both the price of renewables and their own environmental policies.
Now regarding the environmental impact of producing solar panels and wind turbines, they clearly are carbon negatives
http://www.drawdown.org/solutions/electricity-generation/roo...
http://www.drawdown.org/solutions/electricity-generation/win...
Though I'm sure they can't have no-impact, you will get some other form of pollution, but at the moment what matters most if reducing our greenhouse effect. It's cheap, it's already there so there's no reason to delay it I think.
China is building tons of new coal plants to cover its current needs. It doesn't seem that renewables are that great, when not subsidized (which is the only true measure of effectivity)