As a general rule of thumb, anything that works within the normal carbon cycle is unlikely to cause problems. There are, of course, temporary issues like major forest fires. Volcanoes create "new" emissions, but it's obvious from history that the planet can shake these temporary spikes off, too.

We had a huge landfill near here that was eventually covered over and "recycled" into a public park and outdoor theater for concerts. A methane recovery system was part of it. There was a short time when the park was new when the recovery system had leaks. The grass in the outdoor theater would "fart" methane, and people could actually light these. A quick refurbishment fixed this. They burn the methane for energy, and actually make money at it.