80.6% of the total energy consumption of the world still comes from fossil fuels. And this percentage hasn't changed much in recent years. This might come as a surprise since climate change and sustainability seem to rank quite high on the international agenda.

Last year, the Doha conference assembled most of the world's countries for the United Nations Framework Convention on Climate Change. The Kyoto Protocol was extended until 2020.

Also at the end of last year, the Climate Reality Project broadcasted a live 24-hour marathon on the impact of climate change. The marathon was seen by millions around the world.

In order to navigate these conversations about sustainable energy and climate change, it helps to have a look at our current consumption patterns. So how much do we consume? What countries are consuming more? And what do we use energy for?

The following infographic is the first of a 2-part series on these questions. This first part is about energy as a whole while part 2 will focus on renewables.

The three fossil fuels, oil, natural gas and coal, were formed millions of years ago when dead plants and animals were trapped under deposits and became buried underneath land. Compression over time fossilised the remains, creating carbon-rich fuel sources. All fossil fuels are finite - the deposits that exist cannot be replenished when they are used. With further use, all are in danger of running out.

The question of when each one will actually run out, however, is a tricky one. There are many different opinions and calculations and none really agree on the exact timing. Many different factors need to be considered including how much of each deposit is left in the Earth, how fast we are using each fossil fuel at the moment, and how this is likely to change in the future. If we start switching to alternative fuel sources that are renewable rather than non-renewable, the reserves that we have will obvious last longer.