ولم ترد معلومات وافرة عن فعالية هذه الخطط، ولا حتى تلك المذكورة في البلاغات الوطنية الأولى والثانية (كندا مثلا).
For example, Canada encouraged manufacturing, processing and mining companies to invest in renewable energy supply (and energy efficiency measures) by allowing these investments to be written off against tax on all sources of income.