The discussion about Husserl's intersubjectivity theory is well established, the discussion about the same from Heidegger is not as extensive. Above all, there is little discussion about Heidegger as a critic of Husserl's intersubjectivity theory. Thus, the present paper describes Husserl's and Heidegger’s intersubjectivity theories in order to be able to account for Heidegger's criticism of Husserl's theory. The paper shows that Husserl bases his theory on empathy, while Heidegger bases it on the care of the equipment world, the They, everyday existence and the public. Heidegger criticizes Husserl for assuming the subject with an inner authentic core on which social and cultural life is incorporated. According to Heidegger, the most primary condition for humans is that we live in a shared world with other people.

The following essay aims to investigate Martin Heidegger’s notion of Dasein in Being and Time by taking into account the therein neglected existential-ontological aspect of birth. The point of departure is the concept of grundsein, i.e. Dasein being handed over itself as itself, groundlessly, with the remaining task of becoming its own basis from which it is able to properly project itself. In Being and Time this is made possible by actively grasping and appropriating ones ’ownmost possibility’ of being-towards-death. The present investigation however, raises the question whether or not Daseins other fundamental limit of being, namely birth, which in Being and Time is continuously disregarded, can provide a different understanding of grundsein; complementing the existing analysis by giving Dasein a more thorough framing. As for the proposed supplementing theory, the essay first turns to the concept of natality as it is developed in Hannah Arendt’s The Human Condition. Thereafter it traces the notion of birth as it unfolds in the work Relating Narratives by the contemporary Italian philosopher Adriana Cavarero, who thematically remains close to Arendt, although not without some crucial differences. With that in mind, the essay finally returns to Heidegger for a critical exploration of the theories opposed.  The present investigation aims to show that these theories of birth does in fact offer insights that are foreign to, albeit not irreconcilable with, the framework of Being and Time. Especially regarding that of mitsein, coexistence, which nonetheless also have inevitable consequences for the question of grundsein. By taking birth into consideration existentially, this essay seeks to shed light on what can be considered fundamentally relational aspects of Dasein as it is shown to be constitutively in-front-of, and a being-from-others. Furthermore there is shown to be an aspect of passive reception to Dasein, more specifically the non-negotiable gift of existence at all which unceasingly remains out of it’s reach; that is, arguably, somewhat overlooked in Being and Time (even though the concepts of thrownness and historicity may indicate such a condition). Lastly the author wishes to embed the existential-ontological matter of birth in the pressing planetary crisis of our time, asserting that the question of (human) birth and existence no longer can afford to ignore these biological-ecological aspects that are undeniably of due importance for the question at hand.

This essay tries to find a possible way for us to deal with the questions concerning climate change by looking into an alternative conception of being. One can speak of the ongoing climate change as a crisis that concerns all of human kind and all beings on earth, but how can we fight it together? The situation demands us to re-think how we humans exist together and among other beings. Despite that the situation calls for instant and radical action, we seem unwilling to do enough. We get stuck on questions about who should take action: is it the politicians or each one alone, or is there something in between? By looking more deeply into the concept of Mitsein as Martin Heidegger depicts it in Being and Time, Jean-Luc Nancy brings to light a possible way past the problematic thought of Heidegger. Nancy shows us in Being Singular Plural that Heideggers exposition on Mitsein is a mere sketch when considering the full potential of the concept. By determining Mitsein as being fundamentally-ontologically originary and anterior to the individuation of Dasein, Nancy opens up a whole new field of thought. According to Nancy, the existential analytic has to begin with something like a ”co-existential analytic”, which will draw the lines for how we exist being-with. With a concept like being singular plural and his way of conceptualizing meaning, Nancy might give us some possible tools to cope with our situation today. Nancys actuality is confirmed by the ecological philosopher Mick Smith, who emphasizes the demand for a new approach towards nature and what it means to be. Smith adds to the essay a glimpse of an emerging philosophical discourse about the thought of an ecological community, where the concept of being singular plural could possibly play a central part.