What are 3 benefits (good things) that come from using alternative sources such as wind, solar and nuclear energy? Please help i t is PAST DUE b alot

Equal volumes of h2 and o2 are placed in a balloon and then ignited. assuming that the reaction goes to completion, which gas will remain in excess? 2h2 + o2 → 2h2o a. both are in equal proportion b. oxygen c. water d. hydrogen