The United Nations has warned that sea levels in the Mediterranean and Atlantic could rise as much as 4 metres by the end of the century.
But some experts are concerned that the worst-case scenario would be a few metres.
“You will have to be very careful about what you put in your swimming pools and gardens,” Dr Sarah O’Sullivan, a sea level specialist at the UK Met Office, told the BBC.
“It is very likely that you will be inundated with water from the sea.”
Ms O’Sullivans concerns are not new, as the seas have been rising rapidly for the past 30 years, causing flooding and droughts.
“There has been a lot of sea level rise over the last 20 years.
That has been pretty dramatic,” she said.”
And in some places, it has even been higher.”
In addition to flooding, the UK has been hit by droughting and other weather-related disasters that have forced millions of people to flee their homes.
Dr O’ Sullivan said that many coastal cities were already under water and that coastal areas were at high risk of flooding.
“We’re all vulnerable to that in many places,” she explained.
“The flooding is going to be more severe because of the current climate, which is more like the Mediterranean climate than we are used to.”
What’s happened in the last few years has shown that the seas are rising, which means more water is coming in.
“Dr O and Ms O’Shanter’s findings have been widely cited by experts and researchers.
However, she said there was no evidence that the sea levels had increased as a result of climate change.”
This is really speculative,” she told the ABC.”
When I started looking at this issue 20 years ago, I didn’t think it was going to happen, but the evidence from the past few years tells us it’s a very real threat.
“The UN’s Climate Change Programme released a report on Friday that estimated that the amount of heat that was being absorbed from the atmosphere by the oceans could rise by a further 2C (4.6F) by the middle of the 21st century.
However the report also found that the effects of climate changing would not be felt for many decades, and that the impact of sea levels would not become severe until the 2060s.”
Sea level rise is likely to have a significant effect on the water levels in some coastal regions, particularly the Mediterranean,” the report said.
In the first two decades of the 20th century, a warmer and drier climate had led to an increase in sea levels of about 0.2mm (0.03in) per year.
However that increase slowed to 0.5mm per year by the early 2000s.
It has now returned to levels that were previously thought to be too high, with the global average level at about 5mm per day.
The report said the amount by which the sea level had risen was a function of the number of people living near the sea and the amount that was stored in the oceans.”
If you are just on land, the amount you can expect to have rising is around 2mm a year, but if you are on a hilltop, it’s between 4mm and 5mm a day,” Dr O’Shells said.
The UN estimates that about 1.5m people live in coastal areas, and they could be affected by the rising seas.”
Our estimate is that there is a 2cm sea level increase by the time we get to the mid-2030s, and then by the mid 2060, it could be up to 3.5 metres,” she added.”
In fact, we think that’s what we’re really looking at right now.