Question

Complete as frases com aforma orreta do verbo entre parenteses
1-there's a more than 90 percent probabbility that human-produced greenhouse gases........... ( cause) much of the observed increase in earth's temperatures over the past 50 years

2- humans.......... ( increase ) atsmospheric CO2 concentration by a third since the industrial revolution begam

3-studies show that solar variabilit ( play ) a role in past climate changes

Answer 1

1. There's a more than 90 percent probability that human-produced greenhouse gases have caused much of the observed increase in earth's temperatures over the past 50 years

2 Humans have increased atmospheric CO2 concentration by a third since the industrial revolution began

3 Studies show that solar variability has played a role in past climate changes