I don’t want to be that guy, and I like animals, but this statistic is highly dependent on their definition of ‘wild animals’.

there are many species that need protection and many nations are not helping, such as China allowing rhino and tiger products trade. some can only do so much to protect animals, like in africa and india, and the seas around Asia that have whale hunting.

well well......

Every country want growth & growth because they can get more tax & money and sell more product and go on..... unless there is a big change in every politics in world. the world is dead, and for me its over already, so many greedy company, corrupt politics and go on, nothing we can do anymore it's so late.

Even ppl, do everyone would like stop take flight and stop go in vaccation ? or eat beef etc etc ? some maybe, but never enough to stop this hell, and with more population every days, that getting worst.

I'm scared for my daughter, for me its no matter i will die before see the worst.

We need Ban flight + beef + plastic, and get birth control, but that will never happening, only one on way is plastic ban, but its so slow and only in few country.

Mainly because we live in a giant ponzi scheme. Pension funds are right now heavily underfunded all over the world, basically, young people that are working today are paying the pensions of the ones that retired, and when these people get the age to retire, it is necessary to have enough new people joining the workforce to pay for their retirement.

If the number of people in workforce decreases due to less births, whereas the number of retirees increase due to aging population, the pension ponzi, which is already exploding, will go 10000% bust and all the people who contributed for their retirement for decades will sadly discover they won't retire because there is no money for them.

Bad news for the world lol. They probably also recognise that the bigger their population the easier it will be to win the economic war with the US. 

why would the world wrestling federation be keeping track of wildlife populations/

We should also note the source. The World Wildlife Fund is famous for exaggerating and embellishing, if not outright lying.  

It should also be noted that had declined in various life forms is not necessarily a good or bad thing. Note the word "necessarily".  I'm not saying that this is good. I'm just saying that this fact, if it is a fact, on its own doesn't really tell us much of value.

In your lifetime? Depending on your age, it is highly possible if things don't change soon (which it wont)  

Isn't the US already pretty much China's bitch?

Modern medicine keeps people alive. Add to that, that the coming generations becoming old are bigger due to big growth happened after the two world wars (old people these days were alive at world war two). So the generations getting old are big and the younger generations are smaller, so overall the country ages. And again, modern medicine let's people get much older.