Climate on an Island World

I'm currently creating a world with a population of about 4.5 billion people and 21st century technology. In fact, the world is strikingly similar to ours. Oh, except the islands that is. The entire world (except the poles due to ice build up) is separated into archipelagos with anywhere between 10-30 islands, biggest islands are no bigger Honshu (biggest of the Japanese islands) with anywhere between 15-100 miles between groups. What would this do to the climate/weather? And would there be a major change in species? (Not talking about aquatic life forms)

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Climate on an Island World

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