Too many diseases in the world

Mankind has always battled diseases, but I think in our modern world, pollution, pesticides, herbicides, etc., wreaks havoc with our immune systems, and then ready transportation between nations makes communicable diseases spread faster. Also, I think so many ways and instant communications makes things seem bigger than they are. Not that many years ago, we in the Americas would never have have even known there was a "bird flu" in Asia, so we wouldn't have worried about it.

If you study the history of many of the diseases around the worl,you will find that each is a normal one for each area or part of the world.say there is one common disease in Africa,and another type in say China,they used to stay in their own areas,but now with the imagration of so many people from differant countries getting together in one country,say Canada,we were not prepared for the disease from Africa,and as they mix with ours,it becomes a brand new strain that gets harder to control. This is only my understanding of what I have seen over the years.

That's a good question - I guess there's many reasons for disease like, climate change, famine, sanitation to name a few. Disease must have been around since the beginning of time as disease is bacteria which is a living organism & therefore I suppose ever since there has been life there has also been disease or at least bacteria.. I'm no ecologist, botanist or scientist (as you can probably tell) so I am most likely completely wrong! I think though, with the ever increasing world population of humans & animals on our planet + climate change the problem will only get worse before it gets any better :(