cameron_

Maybe ご多忙中 (ごたぼうちゅう) is a good example? Something like "Excuse me for interrupting you when you are so busy".

Edit: 盥回し (たらいまわし) - handing off a problem to someone else to evade responsibility

I can't think of any off the top of my head, but might reply again later. You could also check out some 四字熟語, although those are more like proverbs rather than words. Eg. http://www.edrdg.org/projects/yojijukugo.html

Technically speaking, pretty much all of our power is solar power with extra steps.

4 ears > 2 ears