निम्नलिखित में से कौन सा वैश्विक जलवायु परिवर्तन का एक प्रत्यक्ष, व्यापक रूप से प्रलेखित भौतिक संकेतक 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?