No it isn't. We should strife to zero carbon emissions. No amount of insulation or reduction of consumption will achieve this. The best these reductions do is delay the onset of the negative consequences of climate change.

The solution is to replace carbon emission based energy sources and there are plenty of basically infinite energy sources out there. Solar energy, geothermal energy, tidal energy, nuclear fission, possibly nuclear fusion.

Until we've scaled those up we should be reducing our energy consumption. But it's just a stopgap, not a solution.