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That's an interesting theory Brad, if developed countries are contributing to the 'plastic waste in the oceans' problem to any extent, it is probably through the practice of sending plastic waste abroad for 'recycling'. If the recyclers in developing countries can't make use of all the plastic waste they import, they may just dump the surplus in rivers.
After doing a bit of research, I found that China is the world's predominant recycler of plastic waste:
China and plastic waste recycling
The EU apparently exports 87% of the plastic waste it collects to China, including Hong Kong. But China has recently announced a policy where it intends to cut back substantially on importing foreign waste from next year onwards, and will recycle its own domestic waste instead, so much of the plastic waste collected in developed countries may have nowhere to go. If China recycles its own plastic waste, that will obviously keep some of its own plastic waste out of the rivers.
One country I was expecting to be a big contributor to the 'plastic waste in the oceans' problem was Mexico, but that doesn't seem to be the case. Mexico is notorious for having a litter problem, as discussed in this US newspaper article from ten years ago:
Mexico litter problem
Rubbish gets thrown into rivers in Mexico (the article mentions an incident where the Grijalva River got clogged with trash in a narrow gorge), but it may be that the geography of their rivers is such that not much gets carried into the sea.
Time to update this thread, as it looks like the Blue Planet II episode which was going to raise awareness of the plastic waste issue (or the first episode, if it turns out that the issue is being covered in several episodes) was broadcast last Sunday. I didn't watch this episode myself, but the reaction of the relatively new UK environment secretary, Michael Gove, is summed up by this Daily Telegraph article from a few days ago:
Gove reaction to episode
"Michael Gove has vowed to take action over plastic pollution in the oceans after being "haunted" by Sunday night's episode of Blue Planet.
In the episode, which drove some viewers to tears, a pilot whale carried the carcass of its dead baby around for days.
Sir David Attenborough, narrating the episode, suggested the calf was poisoned by its mother's milk, which could have been contaminated by plastic pollution.
Also in the show was a baby turtle, which crew members saved after it became tangled in a plastic net."
As I said in the starting post of the thread, we Brits don't really have to do anything about this. We cracked this potential problem many years ago, over 140 years ago to be precise, when the Public Health Act of 1875 was passed which required local authorities to collect domestic waste and introduced the concept of householders being provided with 'movable receptacles' or dustbins. It is the developing world that doesn't bother with the concept of a dustbin, and is throwing its plastic waste into rivers.
But if we have a 'hard Brexit' (as I'm expecting), and the UK ends up outside the EU Customs Union, then as a born-again independent trading nation we do have the option to raise tariffs on imported goods against countries that dump plastic waste in rivers (if we did feel so strongly about the issue). That would probably be the best action we could take. It's not politically correct to blame the developing world for anything, but they appear to be the main culprits for this plastic waste problem.
Attenborough's suggestion that the pilot whale's calf was poisoned by plastic also sounds a bit dubious to me, so I checked whether there has been any criticism of this claim in the news media. I found this Daily Mail article where an assistant professor in environmental sciences accused Attenborough of peddling fake news:
There was also apparently an article criticising the claim published in the Times newspaper, which is behind a paywall, but one of the BBC bias monitoring blogs, "Is the BBC biased?", has produced a blog post giving a good idea of the content of the Times article:
"The Times reports that the BBC has been accused of "not making clear that it had no evidence linking the calf’s death to plastic" despite having made the dead calf "the main focus of a section of the documentary devoted to marine plastic pollution".
Worse, the BBC's main 'defence witness' has spoken out on behalf of 'the prosecution':
The BBC admitted yesterday that it did not know how the calf had died. It claimed the link to plastic waste had been endorsed by Paul Jepson, a vet specialising in whales at the Zoological Society of London who advised the Blue Planet II team. Dr Jepson told The Times that no samples were taken from the dead calf. He said it could have died from a natural cause or chemical pollutants could have been a factor."
Another update - it looks like the final episode of Blue Planet II due to be broadcast next Sunday is going to be the main episode in the series that pushes the environmental causes according to the Guardian:
final episode of Blue Planet II
"The world’s oceans are under the greatest threat in history, according to Sir David Attenborough. The seas are a vital part of the global ecosystem, leaving the future of all life on Earth dependent on humanity’s actions, he says.
Attenborough will issue the warning in the final episode of the Blue Planet 2 series, which details the damage being wreaked in seas around the globe by climate change, plastic pollution, overfishing and even noise.
Previous BBC nature series presented by Attenborough have sometimes been criticised for treading too lightly around humanity’s damage to the planet. But the final episode of the latest series is entirely dedicated to the issue."
I expect that Michael Gove will subsequently announce that he was greatly affected by this episode as well.
Gove's behaviour is a bit strange - when he was made environment secretary a few months ago, many were expecting him to take the Green blob on, not capitulate to it. It was actually Gove, as the education secretary, who invented the useful term 'the blob' to describe the nature of the left-liberal opposition to his attempts to introduce reforms in the education sector. Later on Owen Paterson, just after losing his job as environment secretary, extended the idea to the Greenies, describing them as the 'Green blob'.
The cynical interpretation might be that Gove is trying to improve his prospects of becoming the next Conservative party leader in the event that the party asks Theresa May to stand down as leader before the next general election. There are quite a few Green-leaning people in the Conservative party, and showing concern for the environment is probably regarded as a positive attribute in a leader. The Conservative Home website runs a monthly poll of a sample of party members, and currently Gove is up to second place as the choice for the next party leader, just ahead of Boris Johnson, but behind Jacob Rees-Mogg.
Gove doing well in next party leader poll