I'm sure you've seen this graph that came out recently from Australia and the impact this had. Its carbon emissions were increasing on a plane like this, and when it put a price on pollution, its emissions dropped off precipitously over that two-year period. As soon as it eliminated that price on pollution, its emissions all of a sudden spiked in a drastic manner over the last two years. Is that not a perfect example of the impact a price on pollution can have?
On October 16th, 2018. See this statement in context.