Despite that, he said, his son lived for another decade, during which he often reached out to help others.

NPR: Church: Pastor Rick Warren's Son Commits Suicide

Perhaps the most unfortunate consequences of both the Virginia Tech and Aurora tragedies is that the families of the deceased, the injured and others most exposed to the shooting (including first responders) often do not seek help.

CNN: Aurora shooting like reliving the Virginia Tech ordeal

Though it may be possible to adapt, often imperfectly, to some of the effects of climate change, Mr Victor argues that it is much harder to help others adapt.

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