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An Australian scientist has warned that the "insect apocalypse" will have dire effects on the environment and humanity.

An international study on the future of insects under climate change scenarios revealed that the loss of insects will significantly reduce humanity's ability to build a sustainable future.

Study co-author William Lawrence of James Cook University in Australia said the biosphere has already warmed by about 1.1°C since the industrial era. The temperature is expected to rise by another 2 to 5 degrees Celsius by 2100 unless greenhouse gas emissions are significantly reduced.

Lawrence said in a statement today that the insect's small body size and inability to regulate its own body temperature makes it particularly vulnerable to changing temperature and humidity levels.

He added: “A growing body of evidence shows that many insect populations are rapidly declining in many places. These declines are a source of deep concern, with the media increasingly using terms such as 'insect apocalypse' and even some scientists to describe the phenomenon.

He continued, "The loss of insects is making its way up the food chain, and may already be playing an important role in the widespread decline of their consumers, such as insectivorous birds in temperate environments."

Insects are important parts of biodiversity and provide services to the wider environment, Lawrence said, including pollination, pest control and nutrient recycling, all of which are beneficial to other organisms, including humans.

The study found that climate change amplifies the effects of other factors that threaten insect populations, such as pollution, habitat loss and predation.