A three-year study by Australia's CSIRO and Bureau of Meteorology suggests the Pacific's small island states can expect rising sea levels, more heavy rainfall events, more very hot days and more cyclones.
Photojournalist Rodney Dekker visited Tuvalu and Kiribati for Oxfam to explore how climate change is affecting life there.
He shares his photos alongside quotes from local people.
We know that the rise of the sea is a true thing. It comes in. [It] comes to the dry places, it reaches the unreached spots. Who causes it? Our brothers and sisters in the big countries. I'm asking God to work with the big countries to show mercy to us, to consider our situation.
My message for world leaders now is to ask and to plead with them to ... cut their emission rates to a level where we can be assured that we can be saved in our small island countries.
It is a true thing. The sea level is going up. People are starting to think about migrating to other countries. A lot of our people have migrated to Fiji, to New Zealand, because of what they think is going to happen. Some people panic and don't know what to do. They talk about it every day.
All our traditional skills which have maintained our people for years are all upset because of the changing weather patterns.
I've been travelling from country to country advocating and campaigning on the issue of climate change. The passion, the force that keeps me going, is the realisation that what I received from my ancestors, I won't be able to hand down … to my children and my grandchildren.
That was a drastic night, just terrible. Everyone thought it was the end of the world ... the whole place was under water. Everyone ran for their lives ... We lost our wells, some of our houses ... our crops ... they were all lost.
There's never enough water ... This is Kiribati. This is how we live … When you stay still you cannot survive. We have to use our hands, our minds, our strength, our energy … you have to be strong … But we still need some help."
Every year ... I have been witnessing an increasing in the rate of erosion. I am really concerned about the impacts of climate change and sea-level rise.
"Our culture and our traditions are so valuable. They are part of our identity. We cannot leave that behind. Our country, though small, is peaceful and it is beautiful to us. We cannot just get up and leave."
We can use it as a place to relax and go with friends. If I meet a friend on the road, we'll end up on the runway and talk away.
According to my grandfather ... the distance between the ends of the two islands [pictured above] was so close that if you threw a stone across, it would land on the other island. The mangrove plantation, started in 2007, [is] part of a joint project between Tuvalu and Japan. The purpose [is] to reduce the risk of coastal erosion. This a protection measure for our shorelines.
It is getting very difficult to catch fish now. When I grew up, my grandfather and father used to teach me the shift from one season to the other and how it affects the movement of the fish in the sea from place to place. Those have been upset because of the changing weather patterns. The cost of fish caught around our islands has become very expensive. It is cheaper for a person to walk into a shop and buy a tin of fish ... which is processed thousands of miles away ... than buying fish from a local fisherman.
Our hope is that God will have mercy on us on the low coral islands. I'm asking God to work with the big countries to show more mercy to us, to consider our situation ... I ask ... if they could put us somewhere in their minds.
I believe there won't be any more floods, because of the covenant between Noah and the Lord God. They made a promise during those days that there won't be another flood in the world.