With low to medium confidence, Schneider et al. (2007) projected that for about a 1 to 3 °C increase in global mean temperature (by the years 2090-2100, relative to average temperatures in the years 1990–2000), there would be productivity decreases for some cereals in low latitudes, and productivity increases in high latitudes.Source
Northwest passage opens up for shipping and oil and gas deposits will be more easily accessible.
Also less cost for heating in the winter.
What do you think about it?