A problem that humans, on the other hand, faced 30 years ahead is the problem of global warming over the past 150 years, the Earth's temperature to rise approximately 1 degree Celsius (1.8 degrees Fahrenheit)
Problems that humans face in the next 30 years is the issue of global warming in the last 150 years, global temperatures rose about 1 degree Celsius (1.8 degrees Fahrenheit).
The problem that humans must have met in 30 years is the global warming problem during the 150 years. The temperature of the earth rises about 1 degrees Celsius. (1.8 degrees Fahrenheit).