You can't go nuclear. The plants don't last long enough, they take far too long to safely decommission, the waste is dangerous for thousands of years and the fuel is a scarce commodity. They would have to build untold amounts of nuclear reactors to replace the existing fossil fuel plants and will have great trouble positioning them in areas considered safe.enough. Current technology can't do it, there'd have to be a breakthrough somewhere to make it viable.
Climate change isn't the issue and is a red herring. It's just a symptom of the damage we're doing to the environment, turning the earth into a garbage dump through rampart consumerism. We're wasting all our resources due to greed and very few people give a rat's arse as long as the economy keeps turning. Keep the economy churning by printing money, feed the masses bullshit, buy governments and rake the money in. Society deserves everything it's going to get, the level of general stupidity is quite astounding. If there's a buck in it, they'll kill the last rhino for its horn and the last whale for a bottle of oil. They've already done it before.
Are we affecting the environment? Unequivocally yes. You can't live in a system without affecting the system, it's impossible. Everything you do changes your immediate environment and has a domino effect the further away you go. I'd like to move to another planet, this one is an insane asylum and trying to talk sense is a complete waste of time so I won't bother saying any more. "So long and thanks for all the fish"