This isn't the outcome of just a small group of 'bad guys'. Extinction is a byproduct of the increased footprint of humankind as our populations and their associated demands grow. Climate change is one problem, but it isn't the full problem. For example, you need education (to reduce demand for poached goods), political and economic stability (to reduce conditions of poverty that make poaching a rewarding pursuit, or which might drive people to despoil the natural environment to survive in extreme conditions), and somehow a way to defuse the current engine that requires population growth to fuel economic growth.