The document discusses several topics related to renewable energy and carbon cycling, including the carbon cycle, biofuels, alternate energy sources, reforestation, and coppiced woodlands. It provides details on different types of biofuels like biogas produced from waste materials, and gasohol which is a gasoline-ethanol blend. The advantages of biofuels are outlined as being cleaner burning and helping to sustain fossil fuel supplies, while the disadvantages include requiring large amounts of land and potentially causing monocultures. Reforestation and coppiced woodlands are mentioned as ways to recapture carbon dioxide from the atmosphere.

1. TO LEARN
1.CARBON CYCLE
2.BIOFUELS -
I) SOURCES
II) ADVANTAGES & DISADVANTAGES
3. ALTERNATE SOURCE OF ENERGY –
4.REFORESTATION
5. A COPPICED WOODLAND
CARBON CYCLE &
BIOFUELS

4. BIOFUELS
 BIOGAS ( methane )
FIREWOOD , COCONUT
HUSK , COWDUNG ,
HAY
ADV : DOES NOT
CONTRIBUTE TO ACID
RAIN , CLEAN FUEL –
NO SOOT , SLUDGE –
USED AS FERTILIZER
DISADV : LOTS OF
SPACE , LARGE LAND
 GASOHOL( mixture of
80% petroleum spirit &
20% ethanol )
 SUGARCANE , MAIZE ,
 ADV : cleaner fuel ,
helps to sustain fossil
fuels
Reduces GW
 DISADV : uneconomical
, monoculture of
sugarcane – increases

6. BIOFUELS
 Recycle CO2 in short
periods of time –
carbon neutral
 Combustion of fossil
fuels release CO2 that
was removed .- carbon
positive fuels
 Carbon gets
accumulated until
more forests are
planted