Christian Aid has been campaigning for fair trade since 1992. That's when we helped set up the Fairtrade Foundation and began pestering supermarkets to stock products, like bananas, sugar and chocolate, that promise their growers a fair price.

Fairtrade Fortnight (23 Feb - 8 Mar) is a chance to celebrate – and an opportunity to push for more fair trade around the world.

Chocolate may taste great, but life's not always so sweet for many of the farmers who grow its main ingredient: cocoa.

Ghana, in West Africa grows some of the best cocoa in the world. But many of the cocoa farmers who live there earn less than £1/€1.50 a week from their crop. That's less than it would cost you to buy chocolate bars for a couple of mates and definitely not enough to buy food, clothes and medicine for a whole family.

Cooperatives are groups of people who get together to sell their goods for a fair price. The Kuapa Kokoo co-operative sells its cocoa beans to the Day Chocolate Company, who use them to make bars of Divine chocolate.

And because the cooperative owns nearly half of the Day Chocolate Company, Jennifer's family also gets a share of the profit every time a bar of chocolate is sold.

This means life has improved for Jennifer and her classmates. When she was younger, Jennifer had to leave her family and go to school in Kumasi, two hours away. Now money from the Fairtrade co-operative has paid for a new school to be built in her village. 

Jennifer loves learning English at school. She has great plans for the future. 'I want to be a nurse,' she says. 'Then I can come back here and help my community when they are ill.'