To paraphrase, he sees the vacant biodiversity blog niches as:
Insufficient good, critical analysis and hardly any public debate.
Relating the scientific, technical and policy discussions to people’s daily lives, making them relevant to readers.
Blogging from the most biodiverse countries to audiences in the rest of the world, from South to North.
Under-covered areas - "protected areas and local development; the whole concept of sustainable use; captive breeding and zoos; bioprospecting versus biopiracy; the economic and spiritual values of nature; and ...how to communicate effectively about biodiversity."
Few blogs even have biodiversity in their name... because so few blogs focus purely on biodiversity — and partly because biodiversity is still such an specialist piece of jargon.