Reuters: On the rolling hills of Winona, a fine merino sheep stud, a quiet revolution is taking place which Australian farmers hope will eventually see them selling soil carbon credits in the fight against climate change. Winona’s Colin Seis is one of the country’s leading “carbon farmers” and has for the past 10 years been encouraging the extraction of greenhouse gas CO2 from the atmosphere and increasing the carbon content of his soil to improve pastures. Seis estimates he has …