20080309

Go native while you grow your own.

Two compelling items that appeared recently in The New York Times:

To Feed the Birds, First Feed the Bugs

"Although gardeners might believe that when they plant a butterfly bush, native to China, they are helping butterflies, they are merely attracting the adults who sip the nectar. The plant cannot be eaten by the butterfly larvae.

"The typical garden might hold weeping cherries and rhododendrons, lilacs and crape myrtles. That is beautiful, perhaps, but it's a barren wasteland to native insects and thus birds. Almost all North American birds other than seabirds -- 96 percent -- feed their young with insects, which contain more protein than beef, writes Doug Tallamy, chairman of the department of entomology and wildlife ecology at the University of Delaware.

"[In his book Bringing Nature Home,] Tallamy cites the work of Michael Rosenzweig, an evolutionary biologist based at the University of Arizona, who has analyzed data from all over the world and found a one-to-one correspondence between habitat destruction and species loss. In Delaware, for instance, state ecologists say that 40 percent of all native plant species identified in 1966 are now threatened or extinct; 41 percent of native birds that depend on forest cover are rare or absent.

"If you cut down the goldenrod, the wild black cherry, the milkweed and other natives, you eliminate the larvae, and starve the birds. So the message is loud and clear: gardeners could slow the rate of extinction by planting natives in their yards."

A Global Need for Grain That Farms Can’t Fill

"Everywhere, the cost of food is rising sharply. Whether the world is in for a long period of continued increases has become one of the most urgent issues in economics.

"Many factors are contributing to the rise, but the biggest is runaway demand. In recent years, the world’s developing countries have been growing about 7 percent a year, an unusually rapid rate by historical standards.

"The high growth rate means hundreds of millions of people are, for the first time, getting access to the basics of life, including a better diet. That jump in demand is helping to drive up the prices of agricultural commodities.

"Farmers the world over are producing flat-out. American agricultural exports are expected to increase 23 percent this year to $101 billion, a record. The world’s grain stockpiles have fallen to the lowest levels in decades.

"'Everyone wants to eat like an American on this globe,' said Daniel W. Basse of the AgResource Company, a Chicago consultancy. 'But if they do, we’re going to need another two or three globes to grow it all.'"