bundyauThere are about 47 cities on this little planet with...

bundyau

There are about 47 cities on this little planet with 10,000,000+ populations and there are nearly 150 with populations of 3,000,000+.

The world's population is heading towards 10,000,000,000.

The size of this little planet is finite. Visitors to the International Space Station say it is tiny, but unfortunately, most people are lacking this perspective.

What scrubzor probably does not appreciate is that when he was born the world's population might have been only around 3,000,000,000 (my assumption being that climate change deniers fall mostly into the older 60+ demographic).

What you and him do not appreciate is that the massive multitude of high-population centers on this little plant means that at some point in time, the small pollution nuisance factor in larger cities actually becomes a serious global issue.

When do we reach the threshold where this becomes relevant? At a global population of 3,000,000,000, or 5.000,000,000? perhaps only at 7,500,000,000 or even 15,000,000,000?

I would say, when we can detect measurable change in our physical environment.

Are we there yet? I think the evidence is already overwhelming and it is growing at a staggering pace - just like the world's population.

Unless the 10,000,000,000 (just rounding up to the nearest order of magnitude) people switch to AJM's lithium soon, I'd say we are all pretty rooted.

Hence the angry school children!