Proposal: strive to be a carbon-neutral project

This is an idea that was discussed in Socorro (the 2019 Coordination Meeting) and started out from whether we want to scale back our CI builds to reduce our carbon footprint.

The suggestion we came up with is that regardless of whether or not we scale back the CI, we could consider trying to offset project specific CO2-emissions, such as for travel of project members to conferences or meetings, or also the CI itself. It would be good to figure out what kind of costs we'd be looking at, and also we would need to make sure that any carbon offsetting project we use is actually beneficial. If the costs are reasonable, we could aim to be a 'carbon-neutral open source project'!

Just an idea for discussion and investigation at this stage.

No files or tests are named. Start by reviewing the issue discussion and the referenced 2019 Coordination Meeting context, then investigate emissions from CI, travel, and meetings and assess credible offsetting projects and costs. Done requires an agreed scope, cost estimate, and criteria for selecting an offsetting project.

Written by the indexing model from the issue text.