Climate change, which is now irreversible, will render huge swaths of the Earth uninhabitable.
Ebola or some such virus will painfully kill some very large percentage of the human race.
Innocent children are enduring life in poverty, squalor, and cruelty, only to die young and in pain.
We will all be facially and retinally recognized by the computer, relegating anonimity and privacy to the realms of memory.
Gaza, Israel, Hamas.
The very wealthy will continue to get richer until the economic divide is such that the majority, who are now the new peasants, revolt.
Nukes continue to trickle down to countries and NGOs who will use them irresponsibly.
You get the idea. Is it reasonable to be more frightened for the future than ever before in human history, or has it always been thus? Have there always been people saying, "We only have about ten or twenty years left; then our whole way of life will just be swept away."?