Only way to stop it is to go back to packaging that decomposes or is inert like glass which soon loses the sharp edges.
There's a retired landfill not far from my childhood home which was covered with grass and the area turned into a park. It had vent pipes dotting the large hill colloquially referred to as "mount trashmore", but nothing else was done to manage the vented gases.
Perhaps you meant "may be", rather than "is". Especially if we're talking about landfill practices across the globe.
With that said, it’s entirely possible there are older landfills that are simply exhausting methane into the atmosphere. I expect their numbers to fall over time, as the EPA has a substantial budget (~$100MM) for landfill custodians who would like to remediate their methane disposal.
It also implies that a modest majority of landfills where collection is economically viable are collecting, but there's apparently ~1400 landfills where it isn't gonna happen.
https://www.epa.gov/sites/production/files/2016-08/documents...
1. Reduce 2. Re-use 3. Recycle
In that order.
Stop making crap that breaks. Stop buying crap we don't need.
What can we do? Simple, this is where trade requirements include treating the environment right. We already have restrictions on seafood harvesting and protecting certain species like whales and dolphins. no reason we cannot hold trade to require proper handling of waste and pollution to include penalties and fees on offending nations
[1] https://www.pri.org/stories/2016-01-13/5-countries-dump-more...
[0] https://bigthink.com/philip-perry/why-china-isnt-taking-amer...
[1] https://www.scientificamerican.com/article/china-bans-foreig...
Having lived in North America, South America and China, I can tell you the main difference is packaging. The trash can itself is huge in the US, while in South America people use something closer to a small paper bin. A lot of the trash is organic, but in general, waste management and wastewater treatment in Latin America is awful.
China on the other hand has a big wastewater treatment problem, especially in provinces like Sichuan from what I saw. One village I visited had its main creek contaminated in our generation by a nearby factory. waste generation is also low over there.
https://www.treehugger.com/environmental-policy/trash-number...