Even lockdown was beneficial, they say.
Er... so saying that levels of particulate pollution fell and air quality improved during lockdown, is promoting the UN? Nonsense.
They explain it is only the abuse and exploitation that God will put to an end and that it is possible for the earth to rejuvenate with the right actions.
Well yes, but then that's self-evident (the latter part of your statement in italics) - not necessarily to do with what any specific world body may or may not do.
That is what they explain these organisations are doing.
Stating that some organisation may be attempting to accomplish something is not promoting that organisation. Nowhere does the article imply support for these organisations or express that God (or any JWs) is or should be behind them. There's no over-arching love-in towards the UN or other world agencies here.
God has designed the earth with built-in systems that can withstand the impact of sensible human activity. The Bible foretells that Jehovah God will, at his appointed time, put an end to the abuse and exploitation that has damaged our planet. -Revelation 11:18
This interpretation of Rev 11:18 goes back to at least the Revelation Climax book 1970s, interpreting "ruining the earth" to mean ecological damage. It's not a new teaching, and as far as I'm aware, most JWs accept it already. It's debatable, and most scholars tend to apply it to God repairing moral and spiritual corruption rather than pollution and the like, but the JW teaching isn't, and has never been, that it will come about by human organisations.
This Awake is just another example of the org using cut-and-paste quotes from secular organisations and publications to back up their teaching that the world is going to pieces, and then follow up with the usual selected bible verses to provide the "solutions". They've often used the old "people are trying their best and have achieved some good but..." line of argument in those articles, and they do it again here. That's not an endorsement.
Because it's the Awake, it's geared more to the 'secular' reader so it's lighter on explicit doctrine, but bear in mind it's being offered after they'll have been offering their WT on God's Kingdom for two months, so they're still promoting the "human governments won't achieve this" aspect.
As I said earlier, the only difference is they are more evasive now about the fact they do not support the world's governments - think of the Australian Royal Commission, for example - whereas they used to be more outspoken. This largely seems to be because they fear losing things like their tax-exempt status and having their assets taken away. Not how a courageous organisation representing God should be, of course, but not proof they support UN, just an indication they're trying to avoid direct confrontation (despite still teaching in a more lowkey way that it is coming!)