but the panels need to be replaced after about a decade.
You're using very old information. Current generation solar panels are guaranteed to produce 80% of original power after 25 years. The original 'modern' panel is still working 60 years later, and there are lots of evidence they last at least 30.
Though I agree on the nuclear power. I'd be building at least 300 new reactors if I could. It's just that in my original post I was saying that using solar electricity to pull CO2 out of the atmosphere is stupid, especially at those efficiencies. Note that I said 'Even in'; I didn't mean to say that it was the most efficient option.
And yes, synthetic hydrocarbons produced from nuclear power would be a welcome alternative, though I still hold hope for algae based biodiesel/fuel*.
*You can get oil and diesel out of the fats, ethanol or gasoline equivalent out of the carbohydrates.