Sentences with phrase «begin at extreme levels»

These effects are strongest when P / E ratios begin at extreme levels.

Not exact matches

The late Proterozoic — the time period beginning less than a billion years ago following this remarkable chapter of sustained low levels of oxygen — was strikingly different, marked by extreme climatic events manifest in global - scale glaciation, indications of at least intervals of modern - like oxygen abundances, and the emergence and diversification of the earliest animals.

To help avoid the most dangerous consequences of climate change, ranging from extreme heat, droughts, and storms to acidifying oceans and rising sea levels, the United States must play a lead role and begin to cut its heat - trapping emissions today — and aim for at least an 80 percent drop from 2005 levels by 2050.