Climate change is a critically important issue for the economy. The Clean Economy Alliance, which launched Wednesday, has united under some common principles to support Ontario's commitment to climate action and to make some suggestions for how the province should proceed. We've come together because addressing climate change can benefit our economy, and failing to address climate change would be very costly. Climate change has been called the single largest threat to the global economy, which is why the World Bank says a four-degree world must be avoided.