A scientific study has confirmed global warming has existed, in one form or another, for possibly as far back as the past 85 years, but has affected the Pacific Ocean more severely in recent times.

The climate crisis is said to have tripled the duration of the heatwaves in oceans, activating storms further and destroying ecosystems, including Pacific coral reefs.

The bulk of marine heatwaves this past quarter of a century also would not have occurred if not for global heating that the environmental scientists say is caused from burning fossil fuels.

The prediction for the future also concluded that the marine life will continue to struggle to survive and will be at risk of dying out without environmental changes in the lifestyles of the world's population.

The study that was published in the proceedings of the US National Academy of Sciences proved temperatures have risen to create summer heatwaves in the Pacific Ocean.

The effect on the Pacific region has been most significant, Dr Zoe Jacobs at the UK's National Oceanography Centre explained.

"Ocean heatwaves pose significant risks to the society, with some individual events causing millions of dollars of losses due to impacts on the fishing, aquaculture and tourism industries," she said.

"They have also been found to exacerbate heatwaves on the land and have amplified extreme weather like hurricanes and storms."

Scientists used a method to measure the impacts of climate changes that dated back to 1940.

A model of sea surface temperatures were noted where the scientists removed the heating of oceans that the climate crisis has caused, comparing temperatures from the ocean that showed how a world of modern industrialisation has created that impacts of global warming.

Recent major marine heatwaves once included an exceptionally 'long event' in the Pacific from 2014 until 2015, which caused mass mortality among marine life.

The following 12 months of summer contained an intense heat hitting the Tasman Sea between Australia and Aotearoa/New Zealand in 2015 and 2016.

The analysis of the study revealed there were about 15 days of extreme heat a year across the planet's ocean surface as far back as the 1940s, but the figure increased to an overall average of nearly 50 days per year.

But some regions of the globe, including the western Pacific waters, have at least 80 heatwave days a year.

It was found the seas in the Pacific tropics are already naturally warm and the extra heat from global warming tends to increase the duration of the heatwaves.

"As global temperatures continue to rise, marine heatwaves will become even more common and severe," Dr Xiangbo Feng, of the University of Reading, who led the study team, said.

"Human activities are fundamentally changing our oceans.

"Urgent climate action is needed to protect marine environments."