models versus reality

Are the Coronavirus Models Too Pessimistic?

Unfortunately, if anything, reality has often turned out somewhat worse than predicted.

The White House thinks coronavirus models are too pessimistic. If anything, the evidence suggests the models aren’t pessimistic enough. Their projections of future deaths have often been too low.

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The Hurricane Outlook

The journalists are sure about the 2018 hurricane season. The scientists? Not so much.

I’m actually in Puerto Rico today for a conference on the situation here after Hurricane Maria. Since hurricanes are on my mind, I wondered what the forecast for this year looks like. As it turns out, the headlines give significantly different takes on what to expect. Here is a sample of news stories, all issued …

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5 Lessons from the Financial Meltdown for Environmental Policy

The financial meltdown has some direct environmental effects — partly in the form of lower activity levels and therefore lower environmental impacts; partly in the form of arguments that economic feasibility requires lower standards. But there are some other, more conceptual implications. Lesson One: Complex dynamic systems can deliver ugly surprises. The Dow dropped 50% …

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