Alright, for the first question:
We do have actually a few places that have been virtually untouched and left as they are, but most of them lack any real wildlife because they aren't protected areas and from what I've heard, animals would just wander off outside the places where they lived in into the city and they'd die, and kind of like a domino effect, they disrupted the whole food chain and all wildlife just died. There are other places that were built for people to be kind of a natural area, an example would be Chapultepec, it's a forest that was partially cut down and engineered for the use and enjoyment of people, they even built an artificial lake in it. Despite almost all natural areas being altered or destroyed, there are very few that actually remain, for example one big forest named Desierto de los Leones ("desierto" means desert in Spanish and I have absolutely no idea why it's called like that, it's not remotely a desert). I don't go there very often as it is hard to get there, and actually that's one of the reasons it hasn't been altered.
Just a quick note, the forest is actually pretty big, and there are some pretty deteriorated zones, but there are some others that are untouched.
Second question:
From what concerns Mexico City, I don't think the government does much to help, after all it's a completely urbanized city. As to the rest of the country, the government has been improving what concerns the environmental preservation, but I think that we still have a lot to do because, in my opinion, Mexico does have many other problems and the environment isn't their main concern, but organizations that are pro-environmental have pressured the government to at least do something, but still, the government can be pretty corrupt here in Mexico and with some money, big industries/companies get to keep destroying Mexico's natural environments. Take for example Acapulco Bay, it used to be a great place some years ago, pretty clean and nice, I still got to be there while it was all nice and stuff, but once companies start hearing about this, hotel companies start building lots and lots of hotels there and therefore increasing tourism a lot and as I mentioned before, with some money they paid off the government to allow them to dump all their trash and sewer waste and whatnot into the bay, therefore polluting it and destroying any natural beauty it could've had. I remember before all this, you'd swim under the water and you'd see lots of really nice fish and there were also crabs I think and other animals, but now all you see is trash. Another place that suffered from tourism was Xel-Há, which unfortunately, the place was turned into a kind of waterpark, and this time, it was the government who created this thing. Another example which I'm not entirely familiar with, is that in the bay of Baja California, some years ago, we had this rare species of dolphins named pink dolphins, but because of tourism as well, the bay was polluted and the species disappeared from there. And also we have a lot of deforestation in the jungles that are in the southern part of the country.
It's pretty sad, I'll admit.
And also what you mentioned about external pressure from large companies, especially oil companies here in Mexico, is no exception here. I don't know if you knew about it, but recently there was yet another oil spill in the Gulf of Mexico, and the government isn't doing much because that is a big source of income, and they are not willing to risk it to save the environment, unfortunately.
If there was a third question, I didn't get it or I mixed it with the second one, sorry
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btw, the numbers are for the UK as a whole, which includes Northern Ireland, Wales & Scotland with far less population, so I wouldn't be surprised if ENGLAND (total 80% of UK population) was nearly 50% higher! 
