Yes we do. Any green energy sources currently available are very far off from being able to completely replace fossil fuels, and the load on the power grid is only going to get a lot higher as electric cars become more common.

Things like solar and wind just do not have the output capacity to replace fossil fuel plants entirely, and they require huge expensive battery banks that are not green friendly to manufacture. Hydro provides green energy but is incredibly destructive to the environment downstream, and it requires specific locales.

And our energy needs are only going to continue to grow as the world becomes more electric, nations modernize and advance technologically, and the population grows. Fossil fuels are the most energy dense power source on the planet besides nuclear, and even they are struggling to meet energy demands, aside from the environmental consequences.

Nuclear power, specifically fusion, is how our civilization will need to meet current and future energy demands as we wean off fossil fuels. We will obviously need interim sources as fusion power is still a ways off from becoming a viable energy source, but saying we “don’t need fusion” is an incredibly ignorant thing to say. We absolutely do need it if we want to get rid of fossil fuels for good.

Trillions. Also GPS satellites are extremely useful and provide service to both military and civilian fields. $744 million for three brand new ones doesn’t sound like a bad deal.