Overpopulation is still a problem. In May 2008, the price of grain was pushed up severely by the increased cultivation of biofuels, the increase of world oil prices to over $140 per barrel ($880/m3), global population growth,the effects of climate change,the loss of agricultural land to residential and industrial development,and growing consumer demand in the population centres of China and India. Food riots subsequently occurred in some countries.However, oil prices then fell sharply. Resource demands are expected to ease as population growth declines, but it is unclear whether mass food wastage and rising living standards in developing countries will once again create resource shortages.
A number of scientists have argued that the current global population expansion and accompanying increase in resource consumption threatens the world's ecosystem.
"unprecedented" population growth aggravates many environmental problems, including rising levels of atmospheric carbon dioxide, global warming, and pollution.Indeed, some analysts claim that overpopulation's most serious impact is its effect on the environment. The situation has continued to worsen, as at the time of the 1994 IAP statement, the world population stood at 5.5 billion and lower-bound scenarios predicted a peak of 7.8 billion by 2050, a number that current estimates state will be reached in the late 2020s.
Scientists contend that human overpopulation, continued human population growth and overconsumption, particularly by the wealthy, are the primary drivers of mass species extinction. By 2050 population growth, along with profligate consumption, could result in oceans containing more plastic than fish by weight. In November 2017, a statement by 15,364 scientists from 184 countries asserted that rapid human population growth is the "primary driver behind many ecological and even societal threats.