Kara means taxation. The people will be embarrassed for want of food, at the same time, every year, increase of taxation. That is stated in the Bhāgavata. Durbhikṣa-kara-pīḍitāḥ. So much disturbed that they will give up their hearth and home and go away in the forest. Durbhikṣa-kara-pīḍitāḥ. Ācchinna-dāra-draviṇā yāsyanti giri-kānanam. Dāra-draviṇā, money, wife, children, everything—they will be disgusted: "Now it is impossible to maintain. Let me go away." Yāsyanti giri-kānanam.
So this is the Kali-yuga position. So five thousand years ago, when Kṛṣṇa spoke about Bhagavad-gītā, at that time the position was manuṣyāṇāṁ sahasreṣu (BG 7.3). So sahasra. Now, on account of Kali-yuga, manuṣyāṇām "millions," because it has increased. The Kali-yuga has increased.