It is said that one gets the human form after collecting a lot of good karma, then how the population has increased to such? As it is Kali yuga and good is very scanty and will go down even further as time goes by, number of human beings should be decreasing day by day.
Who gets human form on this earth?
Generally, the cases are:
- Some one could be evolving upwards from lower species of life.
- Some one may have fallen from higher planets after enjoying the results of good karma as stated in the Gita verse below.
When they have thus enjoyed vast heavenly sense pleasure and the results of their pious activities are exhausted, they return to this mortal planet again. Bhagvad Gita 9.21
So we cannot assume that population must decrease in Kali yuga. There is exit and entry going on continously.
Also kali-yuga is not all bad for those interested in self realization. According to Srimad Bhavatam 1.17.38 and 1.17.39 influence of Kali is there only in places where gambling, drinking, prostitution, animal slaughter and accumulation of gold (for material enjoyment) is there.
The process of self-realization in kali yuga is also very easy. Just by chanting the holy names of Krishna one can attain perfection. This is confirmed in Srimad Bhagavatam 12.3.51
kaler dosa-nidhe rajann
asti hy eko mahan gunah
kirtanad eva krsnasya
mukta-sangah param vrajet
My dear King, although Kali-yuga is an ocean of faults, there is still one good quality about this age: Simply by chanting the Hare Krsna maha-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.
Why the population is so high in Kali-Yuga ?
The answer to this question is given indirectly in Shreemad Bhagvat Purana at various places.I will explain the cause through those Shlokas (verses).Before giving that let me give a brief backgroud about Kaliyuga.
There is a story of King Parikshita & Kaliyuga.In which king parikshita gave four places for kaliyuga to live they are 1) Gambling 2) Wine or Alcohol 3) violence 4) Sexual cheating or (Vyabhichara , व्याभिचार)). These are the sanskrit verses from Shreemad Bhagvat Purana telling us the characteristics of kaliyuga.
So What exactly is Kaliyuga-: According to Bhagvatam Kaliyuga means.
यदा मायानृतं तन्द्रायदा मायानृतं तन्द्रा निद्रा हिंसा विषादनम।
शोको मोहो भयं दैन्यं स कालिस्तामस: स्मृत ॥30॥
yadā māyānṛtaṁ tandrā nidrā hiṁsā viṣādanam
śoka-mohau bhayaṁ dainyam sa kalis tāmasaḥ smṛtaḥ
Meaning - When there is a predominance of cheating, lying, sloth, sleepiness, violence, depression, lamentation, bewilderment, fear and poverty, that age is Kali, the age of the mode of ignorance.
characteristics of this Kaliyuga
दस्यूत्कृष्टा जनपदा वेदा: पाखण्डदूषिता:।
राजनश्च प्रजाभक्षा: शिश्नोदपरा द्विजा:॥32॥
dasyūtkṛṣṭā janapadā vedāḥ pāṣaṇḍa-dūṣitāḥ
rājānaś ca prajā-bhakṣāḥ śiśnodara-parā dvijāḥ
Meaning - Cities will be dominated by thieves, the Vedas will be contaminated by speculative interpretations of atheists, political leaders will virtually consume the citizens, and the so-called priests and intellectuals will be devotees of their bellies and genitals.
पितृभ्रातृसुहॄज्ज्ञातीन हित्वा सौरतसौह्यदा:।
ननान्द्रुश्यालसंवादा दीना: स्त्रैणा: कलौ नरा:॥37॥
pitṛ-bhrātṛ-suhṛj-jñātīn hitvā saurata-sauhṛdāḥ
nanāndṛ-śyāla-saṁvādā dīnāḥ straiṇāḥ kalau narāḥ
Meaning- In Kali-yuga men will be wretched and controlled by women. They will reject their fathers, brothers, other relatives and friends and will instead associate with the sisters and brothers of their wives. Thus their conception of friendship will be based exclusively on sexual ties.
न रक्षिष्यन्ति मनुजा: स्थविरौ पितरावपि ।
पुत्रान सर्वार्थकुशलान क्षुद्रा:शिश्नोदरम्भरा॥42॥
na rakṣiṣyanti manujāḥ sthavirau pitarāv api
putrān bhāryāṁ ca kula-jām kṣudrāḥ śiśnodaraṁ-bharāḥ
Meaning - Men will no longer protect their elderly parents, their children or their respectable wives. Thoroughly degraded, they will care only to satisfy their own bellies and genitals.
So from above shlokas(verses) we come to know that in Kaliyuga People's mind are corrupted due to excessive materialistic desires.They are more sexual pleasure oriented. They are only thinking of satisfying there sense's or sexual desires.
And I think that is one of the reason of high population in Kaliyuga.
Firstly, the concept of population control, materialistic competition, abortion, sexual gratification, rape, cheating, divorce, etc. are all normal concepts for Kali Yuga, where people have no respect or inclination or rather that intellect required for spiritual learning and knowledge of the Self.
A detailed analysis of Kali Yuga's symptoms is given in the Srimad Bhagavatam, which is one of the famous Puranas.
dāmpatye 'bhirucir hetur
strītve puḿstve ca hi ratir
vipratve sūtram eva hi
Men and women will live together merely because of superficial attraction, and success in business will depend on deceit. Womanliness and manliness will be judged according to one’s expertise in sex, and a man will be known as a brahmana just by his wearing a thread.
EXPLANATION : Just as human life as a whole has a great and serious purpose -- namely spiritual liberation -- fundamental human institutions such as marriage and child-rearing should also be dedicated to that great objective. Unfortunately, in the present age the satisfaction of the sex impulse has become the overriding, if not the exclusive, reason for marriage.
The sexual impulse, which induces the male and female of almost every species to combine physically, and in higher species also emotionally, is ultimately not a natural urge, because it is based on the unnatural identification of the self with the body. Life itself is a spiritual phenomenon. It is the soul that lives and gives apparent life to the biological machine called the body. Consciousness is the soul's manifest energy, and thus consciousness, awareness itself, is originally an entirely spiritual event. When life, or consciousness, is confined within a biological machine and falsely mistakes itself to be that machine, material existence occurs and sex desire arises.
sādhutve dambha eva tu
svīkāra eva codvāhe
snānam eva prasādhanam
A person will be judged unholy if he does not have money, and hypocrisy will be accepted as virtue. Marriage will be arranged simply by verbal agreement, and a person will think he is fit to appear in public if he has merely taken a bath.
dūre vāry-ayanaḿ tīrthaḿ
satyatve dhārṣṭyam eva hi
yaśo 'rthe dharma-sevanam
A sacred place will be taken to consist of no more than a reservoir of water located at a distance, and beauty will be thought to depend on one’s hairstyle. Filling the belly will become the goal of life, and one who is audacious will be accepted as truthful. He who can maintain a family will be regarded as an expert man, and the principles of religion will be observed only for the sake of reputation.
evaḿ prajābhir duṣṭābhir
yo balī bhavitā nṛpaḥ
As the earth thus becomes crowded with a corrupt population, whoever among any of the social classes shows himself to be the strongest will gain political power.
triḿśad viḿśati varṣāṇi
paramāyuḥ kalau nṛṇām
The maximum duration of life for human beings in Kali-yuga will become fifty years.
So as we see here, texts absolutely prove how gratifying the procreating sense pleasures lead us to absolute blindness about God and the spiritual reality. Hence taking procreation for granted, we find the population high. As a balance, Prakriti also caused their lifespans to decrease vastly from earlier yugas.
Looks like more than the current population existed during Mahabharata:
jīvatāṃ parimāṇajñaḥ sainyānām asi pāṇḍava
hatānāṃ yadi jānīṣe parimāṇaṃ vadasva me
Vaishampayana said, ‘If, O son of Pandu, thou knowest it, tell me the number of those that have fallen in this battle, as also of those that have escaped with life!’
daśāyutānām ayutaṃ sahasrāṇi ca viṃśatiḥ
koṭyaḥ ṣaṣṭiś ca ṣaṭ caiva ye 'smin rājamṛdhe hatāḥ
"Yudhishthira answered, ‘One billion 660 million and 20,000 men have fallen in this battle. Of the heroes that have escaped, the number is 240,165.’
More than 166 crore men have died in Mahabharata. Many men survived. I think they were soldiers.If soldiers were lived in this huge number, then think about the population. So, your question on why population is high in Kali Yuga is likely invalid.
There is an obscure rule of karma:
When a human kills an animal intentionally, it generally gets reborn as a human. If the human is degenerate, he may slip back and be born as what he killed.
An analogous truth can be easily found in the scriptures: when God incarnates, and slays whichever Asura is causing havoc, the Asura is liberated; he attains proximity with God (born in a high loka), and becomes enlightened.
When a human kills an animal, the animal attains human form. This is one of the reasons why it is not good to kill as many animals as we do; too many humans have to be born as a result of that, which upsets the dharma (order) on earth.
But hey, the dharma of kali-yuga is to destroy dharma.