Unless you count in the effects of distributed solar and the environmental effects of building said datacenters in the first place. Many homes with solar produce more than they consume, and many homes pay for heat. Instead of new construction (concrete is another huge CO2 contributor) and AC units or pumping surface water for cooling, putting a server in your house is basically free heat and making use of an existing, underutilized resource.
I could run my entire rack off of one to two solar panels (decommissioned ones from a power farm might I add). Even that would take a few years to pay for itself (when you factor in the costs of mounting and permitting) and my power company over 80% renewables the last time I checked anyway.
I could run my entire rack off of one to two solar panels (decommissioned ones from a power farm might I add). Even that would take a few years to pay for itself (when you factor in the costs of mounting and permitting) and my power company over 80% renewables the last time I checked anyway.