So what are biofuels?

From today petrol and diesel which is sold at UK pumps now has to include at least 2.5% biofuels.

Biofuels are renewable fuels, made from crops such as sugar cane, plam oil or maize, have been added to fuel sold around the country.

There are arguements against use of biofuels. Some people say they contribute more greenhouse gases than they save. Also it is said that current rise in food prices across the world is because some farmland is being used to produce biofuels instead of food crops.

What is the conflict in Darfur, Sudan, all about?

Read about Darfur on the CBBC site. Today a major campaign called Global Day for Darfur is being launched to highlight the problems being caused by the conflict for the children of Darfur.

Why is the cost of food rising around the world?

The first reason why prices are rising is growth in the world's population, which puts pressure on a range of resources, including land, water and oil, as well as food supply.
Secondly as countries such China and India gain economic growth they are generating consumers who buy more meat and food.
Thirdly all these extra people have put an environmental pressure onto the planet, as well as the impact of climate change. Desertification is accelerating in China and sub-Saharan Africa, while more frequent flooding and changing patterns of rainfall are already beginning to have a significant impact on agricultural production.
And global warming has played a significant role in another driver of rising prices because land is also being used to grow crops for biofuels instead of food. Find more details from the BBC here.