Before the fukushima isaster, japan got about 35 % of its electricity from nuclear power. That fell suddenly to zero and how did the japanese make up the loss? They started importing natural gas from china and elsewhere. And what happened as a result of importing those sources of energy from elsewhere is that the price of energy went up. Some people suffered significant consequences was a result of cutting back on their energy usage. The researchers found that the increase in mortality from cold temperatures was mainly due to cardio vascular disease.