User:Hydrogen and Time/Nuclear fusion

Nuclear fusion refers to nuclear reactions in which two atomic nuclei combine to form a single, heavier nucleus.

Practical fusion power
The only confirmed-viable design for fusion power reactors is the gravitational confinement reactor, in which the gravitational self-attraction of a free-standing cloud of hydrogen is used to maintain the temperatures and pressures required for fusion to proceed. Unfortunately, the engineering and resource requirements associated with constructing such a reactor are prohibitive, as all successful instances of the design have a mass many times greater than the planet Jupiter.

Waste management
While fusion power does not produce the archetypical "spent fuel"-type nuclear waste associated with nuclear fission, the other forms of waste (neutron-irradiated coolant, tools, and reactor vessel structural materials) will still arise.