New York City Emits 1% of US Green House Gasses

Intresting to know that…

New York City produces nearly 1 percent of the nation’s greenhouse gas emissions — an amount that puts it on par with Ireland or Portugal — according to a city study.

The study found that the buildings, subways, buses, cars and decomposition of waste in America’s most populous city produced a net emission of 58.3 million metric tons of greenhouse gases in 2005.

The U.S. total was 7.26 billion metric tons for that year.

But it is also noted that

The city has 2.7 percent of the country’s population — 8.2 million of 300 million — and the average New York City resident contributes less than a third of the emissions generated by a typical American.

Average, Americans emit 20.23 metric tons of CO2 per year (2002), and New Yorkers would be emitting around 7.11 metric tons of CO2. Comparing this number to other OECD countries CO2 emission per capita (list here), New Yorker is still doing slightly worse than Switzerland, Sweden, Portugal, France and Malaysia but on par with Spain and Italy.

Picture: Ume

Kyoto: Zuishin-in Ume, originally uploaded by micpohling.

Ume at Zuishin-in, Kyoto.

Math! How much CO2 is released by Dairy Cow?

Yes, I did it on CO2 emission by human being, CH4 emission by dairy cow, and this time: CO2 by dairy cow! Yes, dairy cow, just like any other animal being, do respiration, and exhale CO2 as well.

From this paper, the lactating cows are emitting 6137 ± 505 L CO2 per day (before correcting the gas emission from manure) or 5756L (value#1) per day (after substraction of CO2 emission from manure). The value of CO2 emission from some other references is cited in the same paper as well: 4940L (value#2), 5396L (value#3) and 6515L (value#4) per day.  These 4 values will be used to calculate how much CO2 is released by all the dairy cows in the world in 1 year and is shown with the table below:

And compared this value to human being on earth (as of year 2007), human population is breathing about 1362 million tonnes (case#1) or 2618 million tonnes (case#2) CO2 per year. By comparing the numbers here, dairy cow is pretty much catching up with human being, even though their number 0.238 billion is far less than human population, 6.6 billion.

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