Science Matters by David Suzuki It should be evident that a national government has the authority to set policy for nationally important issues. But with the climate crisis, some provincial premiers have pushed back. Governments of Alberta, Saskatchewan and Ontario have been fighting in court to overturn the federal Greenhouse Gas Pollution Pricing Act. On March 25, in a significant victory for climate action, Canada’s Supreme Court ruled in the federal government’s favour. The court affirmed that climate change, caused mainly by greenhouse gases emitted into the atmosphere through burning fossil fuels, is “a threat of the highest order to the country, and indeed to the world” and that there is “broad consensus among expert international bodies that carbon pricing is a critical measure” to reduce emissions.