NEW YORK — Coke, Pepsi and Dr Pepper said Tuesday they’ll work to reduce the calories Americans get from beverages by 20 percent over the next decade by more aggressively marketing smaller sizes, bottled water and diet drinks.

The announcement was made at the Clinton Global Initiative in New York City and comes as the country’s three biggest soda makers face pressure over the role of sugary drinks in fueling obesity rates.

The commitment follows the way customers’ tastes are already changing: People have been moving away from soda on their own for several years. In response, Coca-Cola and Pepsi have been pushing smaller cans and bottles, which tend to be more profitable.