Last May, a reader chided me after I ran an article on milk’s carbon footprint and how it has gone down over the past 67 years.

“…do you really think anyone with a brain cares about the ‘carbon footprint’ of milk? Give me a break. Dairy farms are vanishing, the industry is being destroyed by USDA regulations and someone is actually concerned about phantom science. Please concentrate on improved profitability issues and preserving remaining dairies,” he wrote.

That comment, posted in the reader-comment section of our daily electronic newsletter, made me think: Does anyone really care about carbon footprints? Should they care?

This week, I was reminded once again that they should.

The dairy industry is engaged in a public-relations battle on many fronts. One of those fronts, of course, is the natural environment and how dairy is impacting it.

Several people forwarded me a blog that was run on the TIME magazine web site entitled, “How meat and dairy are hiking your carbon footprint.” It was the usual anti-meat, anti-dairy diatribe, and I won’t go into specifics. A few years ago, when we looked into a TIME magazine article entitled "The Real Cost of Cheap Food," we realized it was slanted toward a particular point of view. Read more.

But some people believe this stuff and think it is objective journalism.

That is why the dairy industry must take the carbon footprint debate seriously and have a good argument in place for the critics.

I do not profess to be an expert on the subject. But I have heard dairy scientist Jude Capper, of Washington State University, speak on the issue numerous times. What she says makes perfect sense: We have reduced our carbon footprint by a significant amount over the past 60 to 70 years because there are fewer cows and the production systems have become more efficient. In 1944, there were 25.6 million dairy cows — nearly 17 million more than currently is the case. Seventeen million fewer cows means there is less methane produced!

Of course, it is more complicated than total number of cows. There are a number of factors, including crop production and the inputs needed to produce milk. This story details what scientists have found. They have determined that a typical dairy farm produces 1.35 pounds of carbon equivalent for every pound of milk produced. It’s become a science and you need to stay on top of it!

The animal-rights activists and liberal media are doing everything they can to bring down modern agriculture. It is your duty to be aware of this and fight back.

Yes, you should care about carbon footprints.