I am quite obsessive by nature.
Look at climate change. That's a bigger problem than plastic, but we can't all focus on that and forget about plastic - that isn't how the world works. We can divide our attention across different things, using clean-up to strengthen prevention.
When I started there was this consensus that you could never clean this up, that the problem is way too big, the ocean is way too rough, the issue of bycatch - 'plastic is too big, plastic is too small.'
There are already dozens of organizations working on trying to prevent plastic from going into the ocean, through advocacy, education, awareness, all great work, yet nobody was addressing the stock of existing pollution.
The concentration of plastic is rapidly increasing in the gyres. Even if you were to close off the tap, and no more plastic entered the ocean, that plastic would stay there, probably for hundreds of years.
I think very often problems are so big, people approach problems from the bottom up: 'If only I do this little bit, then hopefully there will be some sort of snowball effect that will be bigger and bigger.' I'm much more in favor of the top-down approach to problem-solving.
The way you advance a technological society is to try things - to be controversial and contrarian in your thinking in order to get to something that eventually people say, 'I told you it was a great idea.'