Which of the following is true about the role of renewable energy in reducing greenhouse gas emissions according to the passage?        
i.        Renewable energy has no significant impact on reducing greenhouse gas emissions.     
ii.        Renewable energy adoption is primarily driven by government incentives.    
iii.        Renewable energy is a key component of efforts to reduce greenhouse gas emissions.   
iv.        Transitioning to renewable energy sources is prohibitively expensive for most countries.  
v.    Renewable energy cannot help in reducing greenhouse gas emissions.