Droughts are more frequent, crops fail, livestock die, and it's the world's poor who suffer the most.
In Kenya, the failure of the country's 'long' rains means that nearly four million people are already in need of food aid.
Our video of partners distributing water in rural Kenya gives you an idea of how desperate the situation has become.
People are already suffering because of climate change, but it doesn't have to be this way - find out how you can help.
How you can help
By setting up a £5 direct debit to Christian Aid you are making a regular commitment to tackle the effects of climate change on the world's poor.
Donating £5 a month could help our partners construct dams so that people don’t have to rely on the rains to grow their crops and feed their family.
Just £5 a month could help families to plant trees to help prevent soil erosion.
£5 a month could provide drought-resistant seeds that need less water to grow.
Climate change costs lives but you can help change this.
Using the Donate now box on our homepage you can also make a one-off cash donation and help us fight climate change