I think that environmental issues are the biggest threat. The Earth's population has grown very rapidly over a relatively short period of time. Along with population growth, technology has improved in leaps an bounds! This has required and allowed us to produce way more than we did before. We are generating so much pollution and waste. I think this is the biggest issue we're dealing with, though I think many countries are already making great progress to improve the situation. I hope we will see good solutions to combat this threat throughout the world. I heard that McDonald's is testing non-plastic straws and they might introduce them worldwide eventually.