Absolutely none.

The solar radiation received on Earth amounts to about 1.5 KW per square metre. That's about equivalent to carpeting the whole world (including the oceans) with electric heaters. No personal or industrial requirement could make a blip in that figure.

Any energy system that did not create greenhouse gas (methane, carbon dioxide, water vapour) would be absolutely just dandy.

The issue at present is not the heat energy we release. It is just that our technology for our meagre energy requirements affects the composition of the atmosphere in a way that traps the incident solar radiation.

As something of a global warming sceptic, I have to point out that atmospheric composition is affected in much the same way by natural phenomena like volcanic activity, oceanic acidity, and so on that might be completely unrelated to any man-made effects. And quite possibly our Sun is a variable star, and our chaotic weather system may have various long-term pseudo-stable configurations that change the whole scheme.

However, if you have a method for nuclear fusion on your garden shed, please do not let my cynicism prevent you from making it available to us all.