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Those who are intelligent take advantage of the greatest yajña in this age by chanting the Hare Kṛṣṇa mahā-mantra in congregation. When the Hare Kṛṣṇa mantra is chanted by many men together, the chanting is called saṅkīrtana, and as a result of such a yajña there will be clouds in the sky (yajñād bhavati parjanyaḥ). In these days of drought, people can gain relief from scarcity of rain and food by the simple method of the Hare Kṛṣṇa yajña. Indeed, this can relieve all of human society. At present there are droughts throughout Europe and America, and people are suffering, but if people take this Kṛṣṇa consciousness movement seriously, if they stop their sinful activities and chant the Hare Kṛṣṇa mahā-mantra, all their problems will be solved without difficulty. 
https://vedabase.io/en/library/sb/9/1/17/
Chanting of the Hare Kṛṣṇa mahā-mantra is potent always, but it is especially potent in this Age of Kali. Therefore Śukadeva Gosvāmī, while instructing Mahārāja Parīkṣit, stressed this chanting of the Hare Kṛṣṇa mantra.
“My dear King, although Kali-yuga is full of faults, there is still one good quality about this age. It is that simply by chanting the Hare Kṛṣṇa mahā-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.” (Bhāg. 12.3.51) Those who have accepted the task of spreading the Hare Kṛṣṇa mahā-mantra in full Kṛṣṇa consciousness should take this opportunity to deliver people very easily from the clutches of material existence. Our duty, therefore, is to follow the instructions of Śrī Caitanya Mahāprabhu and preach the Kṛṣṇa consciousness movement all over the world very sincerely. This is the best welfare activity for the peace and prosperity of human society.
https://vedabase.io/en/library/sb/8/5/23/#:~:text=Chanting%20of%20the%20Hare%20Kṛṣṇa,of%20the%20Hare%20Kṛṣṇa%20mantra.&text=“My%20dear%20King%2C%20although%20Kali,good%20quality%20about%20this%20age.