Humans may have reached their maximum limits for height, lifespan and physical performance, according to a first-of-its-kind research that looked at 120 years worth of historical information. Scientists suggest that humans have biological limitations, and that anthropogenic impacts on the environment - including climate change - could have a deleterious effect on these limits. Despite stories that with each generation we will live longer and longer, this review suggests there may be a maximum threshold to our biological limits that we cannot exceed. Researchers studied trends emerging from historical records, concluding that there appears to be a plateau in the maximum biological limits for humans' height, age and physical abilities. Rather than continually improving, we will see a shift in the proportion of the population reaching the previously recorded maximum limits.