People look at everything trump did and think "why can't Biden do the same, but for good?" and the problem is, the government is built to be torn down, not built up.
Biden has no power to take climate action. The EPA doesn't have the ability to just subsidize solar panels or enact taxes on CO2 emissions. They've actually tried to do that for CO2 and that was struck down by the supreme court. [1]
That leaves congressional action to force climate action and, unfortunately we have a 50/50 split in the senate with 2 democrat senators that are weak on climate issues. (50 republican senators that will not support any climate action).
Once you realize this, you understand the solution is voting for democrats to the senate in 2022/2024 so those 2 holdouts don't matter as much. Move the balance of the senate by 2 more democrat senators and you might see some climate action.
Stop being disappointed in biden for not doing what he can't do. Start being mad at the 2 democrat senators and the 50 republican senators who stand in the way.
[1] https://en.wikipedia.org/wiki/Utility_Air_Regulatory_Group_v...