सौर और पवन ऊर्जा से जुड़ी प्राथमिक परिचालन चुनौतियों में से एक के रूप में किसे व्यापक रूप से स्वीकार किया जाता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?