Yes, plenty of alternative energy technologies will emit too much carbon during the transition to make them viable. Right now, whenever we build something, we have GHG byproducts all over the place, so we have to really do the math first. A lot of needles will have to be threaded in the coming years if our civilization as we know it is going to survive.
But that doesn't mean we should just give up. And half measures are no longer an option.
But that doesn't mean we should just give up. And half measures are no longer an option.