There's not going to be anything cheap about fighting climate change. We need to start removing 35-40 gigatons of carbon dioxide from the atmosphere immediately if we want to retard, and begin to reverse, what we've been adding the past several decades. To do that, we're going to have to cease using fossil fuels entirely. China gets 70%~ of their power from just coal and is building hundreds of new coal plants, the United States gets about 60% from fossil fuels (about half of which is coal). China is adding millions of new drivers to the road annually, they have so many new drivers that there is a lottery system to 'win' a spot to test for your license.

Then we have the problem of 1.3-1.5 billion cows. An average cow produces 70 and 120 kg of methane a year. That's 91,000,000 metric tons of methane. Methane is roughly 30x more potent at trapping heat. So conservatively that is 2.73 gigatonnes CO2 equivalent which doesn't include the fuels used to transport them and their feed, the fertilizer manufacturing to fertilize the fields that grow the grain they eat, the cost of refrigerating/freezing their meat...

Over-fishing and acidification is killing off large seaweed and kelp 'forests' in coastal waters, those 'forests' handle a good deal of carbon sequestration.

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Let's just look at a hypothetical. Say we outright banned ALL air travel:

Something like 95 billion gallons of aviation fuel was used last year, that has gone up every year without fail for a decade - it was only 66 billion in 2009. Depending on the type of fuel you're looking at 0.55+ gigatonnes there last year.

A tree, highly dependent upon species, can absorb as much as 48 pounds of CO2 per year. That means you need at least 36.3 million trees.

Healthy forest has 40 to 60 trees per acre. That means at least 946,031 square miles of forest, just to offset last year's commercial air travel.

There's nothing easy about fighting climate change. :(