The only way we aren't going to survive on this planet is if we end up killing eachother off. We will find ways around anything the environment can throw at us, short of a apocolyptic scenario (read: meteor strike). And, sense there is no way to predict that an apocolyptic scenario is going to happen anytime even remotely soon, then there is no reason to worry.
When we run out of fossil fuels, we will result to other resources. By the time we kill off every other living thing on the planet besides humans, we will have found a manner to produce energy for our bodies and every day needs and wants.
The only thing you should fear is them getting killed/traumatized by another person.
Were you killed or traumatized? Prior isn't applicable, latter....meh, your still here and doin alright.