Many plants are found in small towns.
Critics say the current testing program is unscientific because so many plants are not included.
The weak financial prospects for many plants are already being felt.
Throughout Japan, many plants are closed at least for days, with restart dates uncertain.
Although the ensetes are brought inside each winter, many plants are simply discarded, to be grown from scratch in spring.
When the lemming population increases, many plants are consumed, and there is a large accumulation of feces.
In other words, although many plants are more or less safe, possible harmfulness is so common you might as well consider it the default description.
Many plants are poisonous if eaten, such as bracken fern, which poisons cattle and horses, and ragwort, which contains a substance poisonous to the liver of cattle.
Jillian Gregg, an ecologist who led the study, said that while cottonwoods were sensitive to ozone, many plants are susceptible to its effects.
Ma Jun, a water-conservation activist in Beijing, says many plants are underused or left idle because local authorities begrudge the cost of running them.
Many plants are annuals and complete their life cycles in one growing season, after which the entire plant, including the stem, dies.
