Entire world as one family

Here is the basic tenet of Hinduism: Irrespective of our nationality, race, ethnicity, caste, creed, we (the entire world) belong to one big family. If one believes in this philosophy then it does matter which country's citizenship they have, they are a part of this big family. 

Such a mindset enables us as a species to tackle global problems like climate change. Previously such an approach has been shown to work for instance when the world came together to tackle ozone layer depletion due to CFCs. So let us embrace this philosophy in its entirety.

Sanskrit Shloka (couplet):

अयं निजः परो वेति गणना लघुचेतसाम्।

उदारचरितानां तु वसुधैव कुटुम्बकम्॥

Transliteration:

ayaṃ nijaḥ paro veti gaṇanā laghucetasām।

udāracaritānāṃ tu vasudhaiva kuṭumbakam॥

English translation:

This is mine, that is his, say the small minded,

The wise believe that the entire world is one family.

Kannada translation:

ಇದು ನನ್ನದು, ಅದು ಬೇರೆಯವರದ್ದು, ಇಂತಹ ಯೋಚನೆ ಸಣ್ಣ ಮನಸ್ಸಿನವರು ಮಾಡುತ್ತಾರೆ.

ಉನ್ನತ ಸ್ವಭಾವದ ಜನರು ಇಡೀ ಜಗತ್ತನ್ನು ತಮ್ಮ ಕುಟುಂಬವೆಂದು ಪರಿಗಣಿಸುತ್ತಾರೆ.

Hindi translation:

यह मेरा है, वह पराया है, ऐसे छोटें विचार के व्यक्ति करते हैं।

उच्च चरित्र वाले लोग समस्त संसार को ही परिवार मानते हैं॥

Source: Maha Upanishad 6.71–75