But the people that will have to worry about it are the children and grandchildren of the world. The amount of time it takes for the population to crash varies for each individual species, depending upon the numbers, the individual defense mechanisms for such a crash, and many other biological attributes. Failed prophesies of doom are abundant. People tend to take notice of failures more than accurate predictions simply because the accurate predictions comprise their way of life, something people are aware of everyday, and as such is not a surprise. The failures then stand out, especially when projecting a way of life far worse than the current standards.
Some predictions are true.
What is necessary is to look at both short term and long term effects. Unfortunately, short term trends are sometimes considered to be the past 50 years. Short term encloses at the least the past 100 years, with long term stretching from then to ten thousand years past. What is also unfortunate is that both short and long term trends indicate an increase in population in the long term. However, in the short term, specific and limited trends can indicate a decrease of population, which is highly misleading.