Pastoralists in Kenya, rice farmers in India, and industrial feedlot operators in the U.S. have all contended with the increased frequency of drought and erratic weather. New agricultural ideas and actions are essential amid rising climate stress, a growing human population, widespread degradation of ecosystems, and rampant food insecurity; nearly one billion people regularly don’t get enough to eat.

Agriculture isn’t just affected by the effects of climate change. It’s also a significant source of greenhouse gas emissions (GHGs). According to the U.S. Environmental Protection Agency (EPA), the U.S. agricultural sector was responsible in 2011 for 7.2 percent of U.S. GHGs. This doesn’t include emissions from indirect agricultural activities, like clearing grasslands or forests to create farmland, or the fossil fuels burned when transporting agricultural products.

U.S. agriculture is heavily tilted toward large-scale, resource-intensive production of animals and the corn and soybeans that feed them. Corn, soybeans, and hay are the U.S.’s three largest crops. It might be hard to believe, but less than 2 percent of U.S. farm acres grow vegetables or pulses (beans and legumes) and less than 2 percent are planted with fruit or tree nuts.

The U.S. food system is also vulnerable to global warming. The draft National Climate Assessment, prepared by more than 200 scientists for the U.S. government and recently released for public comment, says this: “Production of all commodities will be vulnerable to direct impacts from changing climate conditions on crop and livestock development and yield.”

And, it adds, “Climate change effects on agriculture will have consequences for food security both in the U.S. and globally. . . .” We’ve already seen this. When food prices rose because of the massive U.S. drought last year, increases weren’t just seen domestically. Prices went up around the world. The most negative consequences — putting some staple foods out of reach — were felt in the poorer countries of the global South.

A re-visioning of U.S. agriculture could have vast global impacts. How the U.S. eats and produces its food has an enormous influence on other societies. In countries such as China, meat used to be a condiment or side dish. However, the Chinese increasingly are adopting U.S.-style (and U.S.-size) diets and methods of production, like factory farms, and searching for new sources of animal feed.

In the U.S. alone, nearly 10 billion land animals are consumed each year. Globally, it’s well over 60 billion, and could double by 2050. Meat and dairy production already use 30 percent of Earth’s land surface, 70 percent of agricultural land, and accounts for eight percent of the water humans use, mostly to irrigate feed crops. The global livestock industry is also, according to the Food and Agriculture Organization (FAO) of the United Nations “probably the largest sectoral source of water pollution,” and one of the key agents of deforestation.

Animal agriculture is also a major contributor to climate change. The FAO estimates that 18 percent of global GHGs can be attributed to the world’s livestock sector. Current and former World Bank environmental specialists concluded that a more accurate accounting is 51 percent.

Intensification of animal agriculture means that “the livestock sector enters into more and direct competition for scarce land, water, and other natural resources,” according to the FAO. Increasing demand for grain and oil-meals to sustain the growing livestock population also points to more of the planet’s surface being converted to cropland to grow food for farmed animals, not people. (About 98 percent of soy meal, created by crushing soybeans, is used as feed.)

Notably, these kinds of “indirect” factors were not included in the EPA’s accounting of U.S. agricultural GHGs. Nor were the ways agriculture contributes to global climate change covered in the National Climate Assessment report — a rather puzzling omission.

Other blind spots exist. The U.S. Department of Agriculture (USDA) organized a panel on the 2012 U.S. drought at last year’s “COP18” climate summit in Qatar. When I asked the presenters whether the drought hadn’t provided a strong rationale for reorienting U.S. agriculture to be more sustainable and climate-compatible, it was as if I was speaking Esperanto.

Nonetheless, the facts urge a course correction. The National Climate Assessment is straightforward: “Climate change poses a major challenge to U.S. agriculture, because of the critical dependence of the agricultural system on climate and because of the complex role agriculture plays in rural and national social and economic systems.”

The U.S. has a real opportunity, and a responsibility, to cultivate a global shift away from its meat- and feed-heavy model of industrial agriculture and toward a more sustainable, equitable, and healthier food system. We’re going to need public education, advocacy, technology, science, and individual action. The climate reality is that there’s little time and even fewer resources to waste.

Mia MacDonald is the executive director of Brighter Green, a public policy action tank based in New York working at the intersection of environmental, animal-related, and global development issues. Brighter Green’s Food Policy and Equity Program has completed a multi-year, multi-media project on climate change and the globalization of industrial animal agriculture. Policy papers and documentary videos from the project are available here.

Note: a version of this piece was first published on the Brighter Green Huffington Post’s Green section. With thanks to Whitney Hoot, consultant to Brighter Green, for her assistance.