Good for Earth?

Recently, mass media are fanning that bio fuel is good for Earth. A lot of people believe this word, How about you? Actually, CO2 which exhausted by bio fuel are smaller than fossil fuel's it. But do you know that vast forest cut down to make bio fuel's material, corn, sugar cane and so on? Is this good for Earth? In addition, bio fuel's power is smaller than fossil fuel's it. So, we use fuel which mixed gasoline with bio fuel. Bio fuel's proportion is only about two percent. Is this so good for Earth? I don't think so, how about you?