Ken, I agree that solar and wind are getting closer to fossil in price, and they are indeed saving a chunk of carbon going into the atmosphere. However, I really doubt that they will ever replace enough fossil to reverse the trend of rising CO2 in the atmosphere.
Like planting trees, they aren't enough, but make a contribution. But your point about trees eventually returning carbon to the atmosphere isn't really valid. Of course that will happen, but if you plant long lived trees, it will be in about 2 to 300 years.
By that time, by your own reasoning, fossil fuels will be long extinct and renewables will be super efficient, and generating all the power we need.
Also, quality wood gets used, and might keep the carbon out of circulation for yet another hundred years.
And the rest can be used in wood burners, instead of dug-up fossil fuel.
To say that trees can't replace this or that, and therefor are not worth bothering with, could be said today about wind and solar.
Because the global demand keeps rising, wind and solar aren't going to replace fossil. They will replace SOME.
But CO2 will keep rising in the atmosphere for probably the next fifty years at least. Because of rising demand in the poorer countries.
I personally have more confidence in fusion than you. It's a shame that they aren't putting more money into it to speed it up.
I won't live to see it, but it will eventually be providing all the power we need, I'm sure of that.
In the next fifty years, at the current rate of investment, it won't. But long-term, talking 100 years plus, it will.
Investment will take off, once the big doubts start to reduce.