In fact, there's every reason to think that they'll only get worse, and that's what it would look like if things just stayed the same, at the same linear rate, over the next 20 years.
De fato, há todos os motivos para se pensar que eles só vão piorar, e assim pareceria,  se as coisas permanecessem iguais, à mesma taxa linear, ao longo dos próximos 20 anos.