OSAKA — Six months before Japan hosts a major U.N. conference on biodiversity, the government and major corporations involved in the issue are conducting a series of events to raise public awareness about threats to the world's ecosystems and what can be done to save natural habitats.

But global criticism over Japan's stance on whales, dolphins and tuna has led environmental activists abroad to question if Tokyo can lead in biodiversity preservation.

Some Japanese nongovernmental organizations also wonder if incidents ranging from clashes earlier this year between antiwhaling activists and the whaling fleet to Japan's role a few weeks ago in successfully preventing a ban on bluefin tuna trade will affect the government's ability to successfully host the October biodiversity conference.