For instance, it is chemically possible to combine water (either atmospheric or from a normal water source) with atmospheric CO2 to chemically synthesize hydrocarbons. It just takes energy. So you could have a single, absolutely massive fusion plant next to an atmospheric fuel refinery and use the hydrocarbons for fuel storage and distribution. You could do likewise with hydrogen and oxygen if you wanted to make fuel cells or rockets. And this would probably be cheaper than refining fossil fuels. You could actually run OPEC out of business this way, make the electric car obsolete, make airlines carbon-neutral, etc., etc.

Climate change? Just extract the atmospheric CO2 using cheap fusion energy and turn it into an easily sequestrable form. Nitrogen fertilizers? You can make those from the air too. Drought? Use fusion power to run desalination plants. Arable land becomes a non-issue with fusion because vertical farming becomes easy. Every city could just grow whatever they needed in exactly the right climate conditions in a set of enclosed vertical farms, though they might not need to because energy will be so cheap that there's no problem shipping the stuff from Honduras anyway.

Computation scales with power, too. More power, more computation, except computation produces heat, which you need even more power to chill.