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Current 
 of predicting eruptions include checking 
 activity and carbon dioxide 
. Monitoring the 
 of leaves from space could give 
 predictions. The 
 is easy to understand. As 
 moves up through Earth's crust, it releases 
 dioxide. Trees absorb this and their leaves become greener. A website said: "These 
 can help to protect communities against the worst 
 of volcanic blasts."