Snowman: I find your comments to be offensive and narrow-minded. You are looking at the world through "ethno-centric" glasses. Quite frankly, your attitude towards 'cavemen' is why the rest of the world often views folks from the United States as arrogant, narrow-minded and just plain clueless.
I have been to some very remote parts of the world, including South Africa, Liberia West Africa, and Costa Rica. To put it plain and simple: the people who you label as "backwards cavemen" do not have the same opportunities as you and I do. Now you may say, "Then they should just move to a place where they can do better." Even THAT opportunity is not available to them. They simply cannot afford it! I am uncertain of the costs, but for a man and his family to move out of Kenya to the United States would probably cost the man his lifetime earnings. They are stuck in their lot, and do the best to survive with what means they can survive with.
These people can't afford plywood and nails, so they use what the earth has given them -- mud and straw, and thatch. Don't underestimate their ability to think -- they may not be able to code in HTML, but they know what plants and animals are good to consume, and which ones are poisonous. They know how to fend for themselves without the need to use a credit card, a gun, or the internet. I have seen this FIRST HAND.
Further - I suspect that most of the cavemen who have made a life for themselves and their family are probably happier and more content than you or I, or most of the western 'civilized' world. Riches don't always equate to happiness.
In many parts of the world, there aren't programs like 'government subsidized food programs' or welfare, or ANYTHING. Again - I have seen this first hand. Add to that the fact that there are civil wars, strife, rebel combat occurring all over -- things aren't as peaceful in this world as we ignorant Americans believe.
If you are so troubled by how much the cavemen are destroying our world

then instead of posting something so far from the truth and ignorant, why don't you do something about it -- go out into the world and see for yourself what's going on, and try to make a difference.
-Z-man.