If everyone lived like you, how many earths would we need?

We live on Earth, and each person consumes a great deal of resources every day. Some are directly taken from nature (such as solar energy, hydropower, etc.), while others are indirectly consumed (such as electric power, etc.). In other words, every day we live, the resources on Earth diminish somewhat. So, if everyone in the world lived like you, how many Earths would we need to sustain our existence?