How do you recommend governments act to reduce carbon emissions?
Of the 186 billion or so tons of carbon that are dumped into the atmosphere on an annual basis from various sources, human activity - ALL human activity - is responsible for less than 10 billion of those.
Historically, we're at the tail end of an interglacial period, which happens every 100,000 years (and have for millions of years), give or take, and last between 15,000 and 20,000 years, on average. When this interglacial period ends, we're going to be dumped back into an ice age, just as has happened every single time the earth has had an interglacial period in the past. Reducing carbon emissions will do nothing to encourage or prevent this, as warming and cooling cycles have happened consistently for millions of years, despite CO2 ppm ranges from the current 380 or so, up to over 7000 in the Cambrian period. Late in the Ordovician Period was actually an ice age, even though atmospheric CO2 was over 4000 ppm. Anti-carbon global warming proponents typically state that 450-500 ppm is a "tipping point" after which there will be no way to stop a runaway greenhouse effect. If this was true, we wouldn't be here, and the earth would already be a second, uninhabitable Venus.
Right now, we're roughly 18,000 years into an interglacial that, historically, should last between 15,000 and 20,000 years. When the current trend of global warming started, 18,000 years ago, it was (obviously) well before industrial pollution, smokestacks, automotive exhaust, etc. Despite this, the average earth temperature climbed by approximately 9 degrees Celsius, and sea levels rose by 300 feet. The 1 or 2 degrees for the last century or so that we're panicking over right now isn't even close to the limit of natural temperature changes due to these cycles, so it's absolutely impossible to state that human activity is causing any temperature changes at all. The last 120 years of temperature changes aren't even statistical noise in the history of the earth. Incidentally, right now is not even the warmest global average temperature in recent history. During a period extending roughly from AD 1000 to 1300, there was a period called the "Medieval Warm Period" which was slightly warmer than it currently is today. This was followed by a "mini ice age" for about 650-700 years, which we are currently emerging from. The currently slight warming trend is almost guaranteed to be due to this, rather than atmospheric CO2. This Medieval Warm Period isn't the warmest recent period that we know of, though. From approximately 7500 years ago to 4000 years ago was a period known as the Holocene Maximum, which is the hottest period in human history.
Now, when the current interglacial ends - and it will - we'll be dumped into another ice age, as I've already stated. During the last ice age, the entire land mass of what is now Canada was completely covered in glaciers. These extended to large parts of the northern US. Similarly, large swathes of Russia and China were buried under ice, as well as England, Scandinavia, etc.
The amount of water tied up in glaciers during this period made the rest of the warmer part of the earth very dry and barren compared to today. Forested areas were very limited, and what wasn't forested was pretty much inhospitable. Today, thanks to natural global warming, the earth is a relative paradise, with plant and animal life in huge areas that were nothing but ice 20,000 years ago.
This is what we're headed back towards, within, at absolute most, 2000 years. With the severe reductions in arable farmland, there is absolutely no way that an ice age earth could support the 7 billion people currently living on this rock. We're concerned about a few thousand deaths and a fair amount of economic damage if sea levels rise a few feet, but completely ignoring the billions of starvation and disease deaths that will happen when the earth enters its next ice age. If it's true that increases in atmospheric CO2 will cause significant global warming (despite all the geological evidence to the contrary), then it might be the only thing that could prevent the next ice age. We should be dumping as much CO2 into the atmosphere as we can, to try to stave off this eventuality.
So, to answer your question of what governments should do to limit CO2 emissions:
Absolutely nothing.