you get issues, like hepatitus C
acid rain air pollution nuclear disaster and destruction of rain forest
Waste and recycling, deforestation, emissions, pollution,
When people realised that landfills: encourage vermin (rats), emit methane gas (a dangerous greenhouse gas), use up valuable land, contain a lot of valuable items that could be recycled...
No. See the related question below about what caused the 2009 Swine Flu.