Reader Conor sends a report about how the extensive use of the weedkiller Roundup has resulted in the emergence of Roundup-resistant weeds. Excerpt:

Just as the heavy use of antibiotics contributed to the rise of drug-resistant supergerms, American farmers’ near-ubiquitous use of the weedkiller Roundup has led to the rapid growth of tenacious new superweeds.
To fight them, Mr. Anderson and farmers throughout the East, Midwest and South are being forced to spray fields with more toxic herbicides, pull weeds by hand and return to more labor-intensive methods like regular plowing.
“We’re back to where we were 20 years ago,” said Mr. Anderson, who will plow about one-third of his 3,000 acres of soybean fields this spring, more than he has in years. “We’re trying to find out what works.”
Farm experts say that such efforts could lead to higher food prices, lower crop yields, rising farm costs and more pollution of land and water.
“It is the single largest threat to production agriculture that we have ever seen,” said Andrew Wargo III, the president of the Arkansas Association of Conservation Districts.

Meanwhile, Kristof has seen an advance copy of a US government report to be released today, about chemicals in our lives. Not good. Excerpt:

The President’s Cancer Panel is the Mount Everest of the medical mainstream, so it is astonishing to learn that it is poised to join ranks with the organic food movement and declare: chemicals threaten our bodies.
The cancer panel is releasing a landmark 200-page report on Thursday, warning that our lackadaisical approach to regulation may have far-reaching consequences for our health.
I’ve read an advance copy of the report, and it’s an extraordinary document. It calls on America to rethink the way we confront cancer, including much more rigorous regulation of chemicals.
Traditionally, we reduce cancer risks through regular doctor visits, self-examinations and screenings such as mammograms. The President’s Cancer Panel suggests other eye-opening steps as well, such as giving preference to organic food, checking radon levels in the home and microwaving food in glass containers rather than plastic.
In particular, the report warns about exposures to chemicals during pregnancy, when risk of damage seems to be greatest. Noting that 300 contaminants have been detected in umbilical cord blood of newborn babies, the study warns that: “to a disturbing extent, babies are born ‘pre-polluted.’ ”

It’s striking that this report emerges not from the fringe but from the mission control of mainstream scientific and medical thinking, the President’s Cancer Panel. Established in 1971, this is a group of three distinguished experts who review America’s cancer program and report directly to the president.
One of the seats is now vacant, but the panel members who joined in this report are Dr. LaSalle Leffall Jr., an oncologist and professor of surgery at Howard University, and Dr. Margaret Kripke, an immunologist at the M.D. Anderson Cancer Center in Houston. Both were originally appointed to the panel by former President George W. Bush.
“We wanted to let people know that we’re concerned, and that they should be concerned,” Professor Leffall told me.