□ □
[□] □
[] □
By 2000 , new cars sold in California will emit only 25 percent of the most harmful pollutants which come from 1993 California vehicles . Reduced summer ablation enhances ice extent and thickness , and the deglaciation is delayed by 2000 years . However , most state governments have recently moved to ensure their school systems are well connected to the Internet by 2000 . By 2000 , between thirty-nine and fifty-four squadrons will be so assigned . According to one estimate , the world will be using 50,000 tons of antibiotics on people and animals by 2000 .