The United Nations (UN) has estimated that today, October 31, 2011, the world’s population has reached seven billion people. That’s 7,000,000,000! Of course, this figure has some margins of error as nobody can really tell the exact population of each country in the world. For your reference, the Philippines is estimated to have a population of 94,013,200 (2010), the 12th largest in the world, with the city of Manila being the most densely populated city in the world with 43,079 inhabitants per square kilometer (District 6 being the most dense with 68,266 inhabitants per square kilometer).
There’s quite a lot of us in the world. I hope we all do our best to save our resources for our children and their children.