How can senior citizens effectively contribute to sustainability?

With baby boomers in North America and baby boomer equivalents in the rest of world right now in their post-retirement phase, the world has tens of millions of senior citizens with significant professional skills and time on their hands. Most importantly, many of them are keen to do their bit for the planet. How best can we utilize this amazing asset in the form of highly capable and motivated senior citizens to make the planet more sustainable?

How will it have a positive impact?

Putting Humans in Better Control of Planet Health

Who will it have a positive impact on?

Urban Community

Highly Vulnerable Entities - Islands, Endangered Species