Where possible use the appropriate vector (.svg) logo:
for black backgrounds, or
for white backgrounds, and ensure they get at least as much clear space as the "with clear space.png" logos.
The svg's are the smallest file-size, yet also higher quality as they are infinitely scaleable.
Smaller files = lower carbon.
Clear space ensures our logo remains visually distinct, prevents clutter, and maintains its impact by avoiding interference from other elements.
Often organisations requesting logos add clear space themselves - if we add extra clear space it only makes our logo look small compared with orgs that don't (example: https://www.ibioic.com/about/#industry-members).
Not at all, have a look at the Main README