Some of the world’s most prominent companies are expected to set a long-term target on Wednesday of powering their operations entirely with renewable energy, the latest in a wave of commitments suggesting that corporations are becoming more serious about battling global warming.

In addition, backers of a campaign to divest from fossil fuels announced Tuesday that investment managers controlling assets of $2.6 trillion had joined their effort, a 50-fold increase from a year ago and a sign that the divestment movement had spread far beyond its modest origins on American college campuses.

Nine major companies are expected on Wednesday to join a global coalition of firms intent on converting to renewable energy. The new members include Johnson & Johnson, Procter & Gamble, Starbucks, Walmart and Goldman Sachs. A handful of the companies have already reached the 100 percent target; others do not expect to do so for several decades, but they are typically setting aggressive interim targets.

For example, Procter & Gamble, the world’s largest consumer-products company, said it would convert to 30 percent renewable energy by 2020, up from 7 percent today. The new target, a culmination of years of environmental efforts by the company, means that Bounty paper towels, Charmin toilet tissue, Tide detergent and many other goods commonly found in American pantries will increasingly be made with green energy.