Pretty spot on as far as I can see.<quoted text>
"Professor Ian Plimer of Adelaide University and Professor Jon Harrison of the University of Arizona accept that oxygen levels in the atmosphere in prehistoric times averaged 35 percent compared to only 21 percent today. The levels are even lower in densely populated, polluted city centers and industrial complexes, perhaps only 15 percent or lower.
Much of this recent, accelerated change is down to human activity, notably the industrial revolution and the burning of fossil fuels. Which means we are slowing down one process, oxygen generation, and speeding up another, carbon dioxide production."
I would like to add tho that if one finds older maps of the world's forests, one will see that it is mostly the tropical jungles/forests that are dwindling at an alarming rate. Those maps show Africa's sub-Saharan forest roughly 1/2 of what they were in 1900 & South America's about 2/3rds of 1900's. Indonesia, Madagascar & Sumatra are shrinking alarming too.
On the other hand, U.S. forest have grown from the colonial days. We are blessed with a fine forest management system & highly productive farms.
BUT, I have witnessed another form of pollution of our seas. I had opportunity to cruise from Evert WA to San Diego on a warship that my son was stationed on. His ship was about to decommissioned so it was being stripped of 'waste' on the cruise south. I witnessed his ship cruising near the continental shelf & simply tossing the predetermined 'waste' over the side!! Some of the items were still in sealed packages against the salt air. I saw cabinets, machine parts & even dollies pitched into the sea.
Like these items couldn't be transferred to another vessel, shore facilities or even recycled as would seem fitting. I also learned that this was a common practice when decommissioning a vessel. The continental shelf must be seriously littered, if not now, just give it time.
His ship eventually was used for anti-ship missile target practice ( the largest ship used for such) & it is now an artificial reef off of Hawaii. The 2nd largest ship used for a reef.
The only excuse, if it is one, is that the Navy did have the ship up for sale to an ally but had no takers for such a ship.