Being a novelist and being a mother have exactly coincided in my life: the call from my agent saying that I had a contract for my first novel - that was on my answering phone message when I got back from the hospital with my first child.

Every minute with a child takes seven minutes off your life.

I look at my four boys, who are the colors of silt, loam, dust, and clay, an infinite palette for children of their own, and I understand that time erases whiteness altogether.

When the scope of the problem seems insuperable, isn't it time to call this one, give it up, and get on with life as we know it. I do know that answer to that one: that's called child abuse. When my teenager worries that her generation won't be able to fix this problem, I have to admit to her that it won't be up to her generation. It's up to mine. This is a now-or-never kind of project.