A pledge by nine grant makers to give $5 billion to conservation efforts that address threats to biodiversity and to help curb climate change is taking a different approach than philanthropy has embraced in the past — one that may require those organizations to do things differently. The announcement made last week of what the grant makers are calling the “Protecting Our Planet Challenge” was designed to help jump-start support for the global effort, dubbed 30×30, to protect 30% of the land and 30% of oceans by 2030, which 72 countries have already signed onto. It will be discussed as a possible global goal in the Convention on Biological Diversity, a United Nations treaty similar to climate agreements.